Email digest for the Global Conservation Forum (ConsDistList) egroup. ------------------------------------------------------------------------------------------------------------
1. Ultra Pure Water 2. RE: Film Viewing: People's Emergency Briefing 3. RE: Film Viewing: People's Emergency Briefing 4. RE: Ultra Pure Water 5. RE: Advice on Housing a Historical Food Object 6. The US Committee of the Blue Shield at Twenty: Two Decades of Protecting Cultural Heritage in Peril 2006-2026 7. 2027 AIC Annual Meeting: Sept 30 Abstract Submission Deadline 8. RE: Defend the National Historic Preservation Act (Section 106) 9. Take a Survey on ICE Preparedness in Cultural Heritage Workplaces - help CHAACo help you! ------------------------------------------------------------------------------------------------------------ 1.From: Sonia Jones Posted: Friday September 18, 2026 10:46 AM Subject: Ultra Pure Water Message: I'm hoping that someone may have encountered a similar situation and be willing to share their experience and/or knowledge. I work in, and am responsible for, the conservation and care of a Grade II* listed building in the UK. One of the building's notable features, and a key reason for its listed designation, is the extensive survival of high-quality interior finishes, including patinated bronze and widespread use of travertine and marble on walls and floors throughout. I was recently brought into discussions regarding a proposal from our cleaning services provider to switch to a product called Clean Zero. >From the very limited technical information available, beneath a considerable >amount of marketing material, Clean Zero appears to be a system that converts >ordinary tap water into ultra-pure water (UPW). Having carried out some further research into the properties of ultra-pure water, I have become concerned about its suitability for use on historic materials. While guidance on heritage applications appears limited, what information I have found suggests that UPW is generally not recommended for certain heritage surfaces and may be particularly problematic when used on travertine and marble. My understanding is that, because ultra-pure water is highly ion-deficient, it can behave as a chemically aggressive solvent, which is one of the reasons it is used in the semiconductor and other high-tech industries. Given the manufacturer's claims that the product is 100% sustainable, entirely harmless, and highly effective at removing staining, particularly from modern carpets and soft furnishings, I am being asked to demonstrate that the potential risk to heritage surfaces is genuine and not simply an objection to a new "wonder product". Has anyone had direct experience of using ultra-pure water in the context of travertine, particularly historic travertine with a high calcium carbonate content, inherent porosity, and an original polished finish? Any insights, evidence, case studies, or practical experience would be greatly appreciated. ------------------------------ Sonia Jones Heritage Lead UK Government Liverpool United Kingdom ------------------------------ 2.From: Maria Giannakeri Posted: Friday September 18, 2026 10:46 AM Subject: RE: Film Viewing: People's Emergency Briefing Message: Hi, when clicking to register only the 29th of September appears. Is there going to be a second announcement for the 30th? ------------------------------ Maria (Marilena) Giannakeri Books and Archives Conservator Volos, Greece [email protected] ------------------------------ ------------------------------------------- Original Message: Sent: 09-17-2026 15:00 From: Yadin Larochette Subject: Film Viewing: People's Emergency Briefing Calling all members of the American Institute for Conservation and all members of the Institute for Conservation: Please join us for a free virtual viewing of the "The People's Emergency Briefing <https://www.nebriefing.org/the-film>", a film produced in the UK on the current climate crisis. Delivered by independent experts, the aim is to fully inform on the risks we face and the solutions available. The film will be shown for FREE online for AIC and Icon members only. This is a rare opportunity, as the film is not usually aired online (Organized by the Icon Sustainability Group). Dates/Times: Tuesday, September 29 4-5:30pmBST/11-12:30pmEDT Wednesday, September 30 9-10amBST/4-5:30amEDT Link to register: https://www.icon.org.uk/events/people-s-emergency-briefing-film-screening.html <https://www.icon.org.uk/events/people-s-emergency-briefing-film-screening.html> ------------------------------ Yadin Larochette https://www.yadinlarochette.com/ <https://www.yadinlarochette.com/> ------------------------------ 3.From: Yadin Larochette Posted: Friday September 18, 2026 2:18 PM Subject: RE: Film Viewing: People's Emergency Briefing Message: Hi Maria,Yes- at the bottom of the screen of the September 29 viewing option, you should see a button "Next". That will take you to the second viewing on September 30.Let me know if you still have trouble.Best,Yadin ------------------------------------------- Original Message: Sent: 9/18/2026 5:31:00 AM From: Maria Giannakeri Subject: RE: Film Viewing: People's Emergency Briefing Hi, when clicking to register only the 29th of September appears. Is there going to be a second announcement for the 30th? ------------------------------ Maria (Marilena) Giannakeri Books and Archives Conservator Volos, Greece [email protected] ------------------------------ ------------------------------------------- Original Message: Sent: 09-17-2026 15:00 From: Yadin Larochette Subject: Film Viewing: People's Emergency Briefing Calling all members of the American Institute for Conservation and all members of the Institute for Conservation: Please join us for a free virtual viewing of the "The People's Emergency Briefing <https://www.nebriefing.org/the-film>", a film produced in the UK on the current climate crisis. Delivered by independent experts, the aim is to fully inform on the risks we face and the solutions available. The film will be shown for FREE online for AIC and Icon members only. This is a rare opportunity, as the film is not usually aired online (Organized by the Icon Sustainability Group). Dates/Times: Tuesday, September 29 4-5:30pmBST/11-12:30pmEDT Wednesday, September 30 9-10amBST/4-5:30amEDT Link to register: https://www.icon.org.uk/events/people-s-emergency-briefing-film-screening.html <https://www.icon.org.uk/events/people-s-emergency-briefing-film-screening.html> ------------------------------ Yadin Larochette https://www.yadinlarochette.com/ <https://www.yadinlarochette.com/> ------------------------------ 4.From: Christian Mueller-Straten Posted: Friday September 18, 2026 2:20 PM Subject: RE: Ultra Pure Water Message: UPW is probably the equivalent of German demineralized water. You are absolutely right to be extremely cautious, as it is one of the most aggressive solvents in existence. Unfortunately, many conservators are unaware of this; they regard it for example as a "clean final cleaning agent"... Ideally, it should be used only in air-conditioning systems, where tap water might cause limescale buildup. Because it constantly seeks to replenish its mineral content, it leaches pigments-for instance, from unvarnished oil paintings. For this reason, the German conservator Dr. Paul-Bernhard Eipper (an IIC Fellow) repeatedly warns against the use of demineralized water in his *Handbuch der Oberflächenreinigung* (Handbook of Surface Cleaning). This Handbook (with 120 contributors) is the European standard and contains also chapters on stone and imitated stone surfaces. See: https://www.ebook-shop-museumaktuell.de/shop Best Christian ------------------------------ [Christian] [Mueller-Straten] [Researcher, Publisher, Art Historian] [Owner] [Verlag Dr. Christian Mueller-Straten] [Munich] [Germany] [0049-89-839 690 43] [https://www.museum-aktuell.de] https://www.museum-aktuell.de/CEO ------------------------------ ------------------------------------------- Original Message: Sent: 09-18-2026 05:10 From: Sonia Jones Subject: Ultra Pure Water I'm hoping that someone may have encountered a similar situation and be willing to share their experience and/or knowledge. I work in, and am responsible for, the conservation and care of a Grade II* listed building in the UK. One of the building's notable features, and a key reason for its listed designation, is the extensive survival of high-quality interior finishes, including patinated bronze and widespread use of travertine and marble on walls and floors throughout. I was recently brought into discussions regarding a proposal from our cleaning services provider to switch to a product called Clean Zero. >From the very limited technical information available, beneath a considerable >amount of marketing material, Clean Zero appears to be a system that converts >ordinary tap water into ultra-pure water (UPW). Having carried out some further research into the properties of ultra-pure water, I have become concerned about its suitability for use on historic materials. While guidance on heritage applications appears limited, what information I have found suggests that UPW is generally not recommended for certain heritage surfaces and may be particularly problematic when used on travertine and marble. My understanding is that, because ultra-pure water is highly ion-deficient, it can behave as a chemically aggressive solvent, which is one of the reasons it is used in the semiconductor and other high-tech industries. Given the manufacturer's claims that the product is 100% sustainable, entirely harmless, and highly effective at removing staining, particularly from modern carpets and soft furnishings, I am being asked to demonstrate that the potential risk to heritage surfaces is genuine and not simply an objection to a new "wonder product". Has anyone had direct experience of using ultra-pure water in the context of travertine, particularly historic travertine with a high calcium carbonate content, inherent porosity, and an original polished finish? Any insights, evidence, case studies, or practical experience would be greatly appreciated. ------------------------------ Sonia Jones Heritage Lead UK Government Liverpool United Kingdom ------------------------------ 5.From: Genevieve Bieniosek Posted: Friday September 18, 2026 9:12 PM Subject: RE: Advice on Housing a Historical Food Object Message: Hi Jennifer, what a fun challenge! Cool, dry, dark, and in a pest-proof container are the best conditions for most baked goods. Be aware if the RH is extremely low there is risk the food will become more brittle and fragile. We have a piece of wedding cake (~100 years old) that we're able to store in a (collections only) cold storage freezer. It's wrapped in several layers of moisture barrier as well as a rigid box to protect from impact. We also regularly inspect the package to check for any moisture or other issues. I recommend Emily Hamilton's excellent paper for more detailed consideration and background material: "The Analysis and Treatment of Food Artifacts: A Sugar Paste Wedding Cake Topper and President Grover Cleveland's Wedding Cake" https://resources.culturalheritage.org/anagpic-student-papers/wp-content/uploads/sites/11/2020/04/anagpic2011_Hamilton_paper.pdf ------------------------------ Genevieve Bieniosek she/her Furniture Conservator Biltmore, Asheville NC ------------------------------ ------------------------------------------- Original Message: Sent: 09-17-2026 18:46 From: Jennifer Jouas-Viall Subject: Advice on Housing a Historical Food Object Hello All, I am looking for advice on the long-term housing and storage of a sugar cookie made in 1993, which is currently housed in a shadow box and is being preserved at my institution as a historical object. I am interested in hearing from colleagues who have experience caring for food items in archives, museums, or special collections. I appreciate any recommendations for housing materials and methods that provide physical protection while helping to minimize deterioration and pest activity. One option I am considering is housing the cookie in a shallow steel container with a fitted, potentially lockable, steel lid. Are there any concerns I should consider regarding ventilation, temperature, humidity, off-gassing, or pest activity, as well as the materials appropriate for lining or supporting the cookie within the container? I am also open to alternative housing methods that may better suit its long-term preservation. If you have experience preserving historical food items, I appreciate hearing about your approaches, recommendations, or relevant resources. Thanks in advance for any suggestions! ------------------------------ Jennifer Jouas-Viall Preservation Specialist UC Davis Library ------------------------------ 6.From: Valeria Orlandini Posted: Friday September 18, 2026 9:12 PM Subject: The US Committee of the Blue Shield at Twenty: Two Decades of Protecting Cultural Heritage in Peril 2006-2026 Message: Date: September 17, 2026 The U.S. Committee of the Blue Shield at Twenty: Two Decades of Protecting Cultural Heritage in Peril USCBS Annual Conference <https://uscbs.org/annual/> As the U.S. Committee of the Blue Shield celebrated its twentieth anniversary yesterday, the American University's Washington College of Law and USCBS brought together experts in cultural property protection for a day of discourse, engagement, future planning and celebration of this milestone. This worthwhile program was organized and hosted by Attorney Patty Gerstenbith, President, and James H. Reap, Vice-President, from the International Council on Monuments and Sites (ICOMOS) thus engaging in advocacy, legal policy, training and mentoring for heritage protection. It mainly featured talks by international cultural heritage professionals from Sudan, Ukraine and Iran, who provided an update on the Blue Shield around the world and in the US. The USCBS conference schedule can be seen here <https://drive.google.com/file/d/1DgeqqnhF17_EYOg4q5XcRY1C9o-M2siC/view?usp=drive_link>. The conference speakers and moderators can be found here <https://canva.link/64uxwncdsg7sgsm>. --- During the USCBS event I mentioned and reminded the attendees and presenters -- how we, as cultural heritage professionals can avoid the risks of another catastrophic fire like the one that destroyed 90% of the collections of the Brazilian National Museum and began around 7:30 PM (19:30 local time) on Sunday, September 2, 2018. <https://en.wikipedia.org/wiki/National_Museum_of_Brazil_fire>National Museum of Brazil fire <https://en.wikipedia.org/wiki/National_Museum_of_Brazil_fire> 8 years have passed and many challenges remain urgent for cultural institutions in the Southern region and in the Americas. I encouraged the USCBS members and attendees to look for ways to help more Latin American countries where they had recent earthquakes, for example in Venezuela and in Colombia. The risks and hazards exist, and it's important to work together. American University's Washington College of Law 4300 Nebraska Ave NW Washington, DC 20016 All the best, The USCBS Team *Attached please find some imaged that I recorded during the conference (without any 'copyrights' from the presenters/ authors/ organizers). ------------------------------ Valeria Orlandini Conservator of Works on Paper and Photographic Materials Chevy Chase MD (301) 657-2682 ------------------------------ 7.From: Tessa de Alarcon Posted: Friday September 18, 2026 9:13 PM Subject: 2027 AIC Annual Meeting: Sept 30 Abstract Submission Deadline Message: Greeting from IWG, The AIC Annual Meeting will be in Albuquerque, NM May 3-7, 2027. May 2027 feels really far away at the moment, but now is the time to be planning! We are going to have an excellent imaging program, and you are going to want to be there! And if you are going to be there, you might as well be a part of the program. And if you are going to be a part of the program, you need to submit your abstract by September 30! (That deadline is less than two weeks away.) What could you submit an abstract for? Imaging Tips Lunch Session This session focuses on practical, cost-effective, and creative solutions for imaging-related challenges and projects that folks can walk away with and easily try back home. These presentations are informal, short (5-7min) presentations on imaging tips, tricks, and tools. *Note that abstracts for the tips are due at the same time as the formal presentation abstracts which is new this year! Specialty/Interest Session: In-situ Photogrammetry for Site-Specific Sites and Monumental Objects - Joint Session (IWG and Architectural Specialty Group) This joint session focuses on scale and in situ photogrammetry, with presentations that provide practical setups, workflows, and solutions for imaging architectural spaces and elements, buildings and sites, or monumental objects in less-than-ideal capture environments. Thematic Concurrent Session: Imaging and Building Trust Following the overall conference theme, this session seeks to examine how imaging and conversations around imaging can aid in building trust. Longer descriptions for each of these sessions are included on the AIC Annual Meeting website (https://www.culturalheritage.org/events/annual-meeting/current-meeting/call-for-submissions <https://www.culturalheritage.org/events/annual-meeting/current-meeting/call-for-submissions>). Please note that there is one submission form <https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fculturalheritage.secure-platform.com%2Fannualmeeting%2F&data=05%7C02%7Cwebbekeats%40si.edu%7C72d6b6fa7edf4c1ab51808df0d87ee4e%7C989b5e2a14e44efe93b78cdd5fc5d11c%7C0%7C0%7C639244549632388566%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=farS9AfbSFjw7pNNgKqb5G8%2Ft0qqQlfx23ivles5qKA%3D&reserved=0>. You will need to create an account on the submission portal to access the form. You can begin a submission and save it to return later. However, you must complete the form and submit it for your abstract or proposal to be considered. For more helpful tips, please refer to the submission instructions. <https://nam02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.culturalheritage.org%2Fevents%2Fannual-meeting%2Fcurrent-meeting%2Fcall-for-submissions&data=05%7C02%7Cwebbekeats%40si.edu%7C72d6b6fa7edf4c1ab51808df0d87ee4e%7C989b5e2a14e44efe93b78cdd5fc5d11c%7C0%7C0%7C639244549632458935%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=391dXu3ePIaT5aMClysHiUOknfkfKTkJr11SxB%2BpzdU%3D&reserved=0> ------------------------------ Tessa de Alarcon Conservator Penn Museum Philadelphia PA [email protected] ------------------------------ 8.From: Hillary Morgan Posted: Friday September 18, 2026 9:13 PM Subject: RE: Defend the National Historic Preservation Act (Section 106) Message: CHAACo also has a new webpage highlighting Calls to Action <https://www.chaaco.org/calls-to-action> related to Cultural Heritage advocacy. Please check our webpage for any future updates related to Section 106 and other urgent topics! ------------------------------ Hillary Morgan Conservator University of Colorado Boulder Libraries Boulder United States ------------------------------ ------------------------------------------- Original Message: Sent: 09-16-2026 13:56 From: Katherine Langdon Subject: Defend the National Historic Preservation Act (Section 106) The Advisory Council on Historic Preservation (ACHP) is advancing a sweeping and damaging plan to rewrite the regulations for Section 106 <https://culturalheritagepartners.com/wp-content/uploads/2026/07/citizenguide2021_011321.pdf> of the National Historic Preservation Act (NHPA), the part that requires federal agencies to evaluate the effects of federal projects on and avoid harm to historic properties. It is hard to overstate the importance of the NHPA and Section 106 to cultural heritage stewardship in the United States. Even if you have not directly experienced a Section 106 review, it has likely reached you indirectly. Every member of AIC and many of our international colleagues have likely visited a site (or many!) protected by, driven on a U.S. federal highway whose route was vetted because of, or knows someone in this sector whose work is profoundly influenced by Section 106. In late July, the ACHP hastily approved <https://www.achp.gov/news/achp-votes-move-forward-notice-proposed-rulemaking> sweeping deregulatory revisions to Section 106 <https://culturalheritagepartners.com/wp-content/uploads/2026/07/citizenguide2021_011321.pdf> of the National Historic Preservation Act (NHPA), sending the revisions to the Office of Information and Regulatory Affairs (OIRA) for critical review before they are published to the Federal Register for public comment.The ACHP is an independent federal agency charged with historic preservation leadership within the federal government. The revisions they have put forth are in contradiction to the protection of historic and cultural places: they curtail public participation, eliminate protections for Traditional Cultural Landscapes, and strip the regulations of the language that ensures meaningful consultation and requires projects to avoid, minimize, and mitigate harm. You can read the redlined version here <https://culturalheritagepartners.com/wp-content/uploads/2026/07/20260717-36-cfr-part-800_nprm-redline_for-achp-vote.pdf> and the draft <https://culturalheritagepartners.com/wp-content/uploads/2026/07/20260717-achp-nprm-part-800-regs_draft_for-achp-vote.pdf> here. New rules under this administration compel OIRA to rush decisions and prioritize deregulation, which does not lend itself to a considered review of this 400-page document with the potential for tremendous negative impact on stakeholder communities, entire industries, and the general public. During this review period, the heritage sector must rally to defend Section 106- and many organizations are answering the call by educating the rest of us, organizing advocacy campaigns, and preparing for litigation. Join and support those efforts by taking some of the following steps now: Watch recordings of webinars hosted by Cultural Heritage Partners <https://culturalheritagepartners.com/war-room-for-threats-to-section-106/> and National Trust for Historic Preservation <https://savingplaces.org/section106> to educate ourselves on what is at stake. Write to your representatives <https://support.savingplaces.org/page/101008/action/1?ea.tracking.id=Website> to share how the revisions will negatively impact historic preservation efforts in your area. Call your representatives with these helpful scripts <https://culturalheritagepartners.com/wp-content/uploads/2026/07/20260722-106-war-call-and-email-scripts-chp.pdf> from the law firm Cultural Heritage Partners <https://culturalheritagepartners.com/defend-section-106/>. Urge your representatives or local organizations to schedule a meeting with OIRA <https://www.reginfo.gov/public/do/eo/neweomeeting>, using the RIN: 3010-AA10, to share concerns about changes to Section 106. Currently, the Office of Information and Regulatory Affairs is in a review process <https://www.reginfo.gov/public/do/eom12866SearchResults?pubId=202510&rin=3010-AA10&viewRule=true> during which interested parties can request meetings to express their concerns regarding proposed changes to Section 106. Here are some suggested scripts and talking points to bring to the meeting: Suggested Talking Points <https://culturalheritagepartners.com/wp-content/uploads/2026/07/20260722-106-war-talking-points-chp.pdf>Script for meeting with your representative <https://culturalheritagepartners.com/wp-content/uploads/2026/08/20260828-section_106_district_meeting_playbook.pdf> Get your organizations to sign the Open Letter to Congress about Section 106 <https://culturalheritagepartners.com/open-letter-to-congress-from-national-coalition/>. Ask your organizations' leadership (e.g., the museum you work at, your professional association, or the local historical society where you are a member) to join hundreds of other organizations around the country, including AIC, in signing a national coalition's call for Congress <https://culturalheritagepartners.com/open-letter-to-congress-from-national-coalition/> to protect our cultural heritage. Be prepared to submit comments to ACHP when the comment period opens later this fall! Watch the NTHP webinar linked above for great tips on writing an effective public comment. We will post again when the comment period begins. Send examples <https://support.savingplaces.org/page/100989/survey/1?ea.tracking.id=Website> to the National Trust for Historic Preservation of success stories where Section 106 led to win-win outcomes. Please join your colleagues in taking action on this important issue now and this fall as we work to protect cultural heritage preservation in the United States, and thank you! Yours in solidarity, The Steering Committee of the Cultural Heritage Advocacy and Action Coalition (CHAACo) www.chaaco.org <https://www.chaaco.org> ------------------------------ Katherine Langdon Conservator San Francisco United States ------------------------------ 9.From: Katherine Langdon Posted: Friday September 18, 2026 9:15 PM Subject: Take a Survey on ICE Preparedness in Cultural Heritage Workplaces - help CHAACo help you! Message: Dear Colleagues, CHAACo wants to help you and your organization get from having resources about preparedness to implementing an ICE preparedness plan. Your feedback helps us understand where the greatest needs and gaps are- what kinds of organizations and workers need support, in which regions, and what sort of support you need. This is your opportunity to shape our efforts! Do you need more information? Leadership buy-in? A seat at the table? Customized training? Legal referrals? Tell us in the survey! <https://www.chaaco.org/resource-hub/immigrants/ice-survey> This anonymous, secure survey is for anyone who works, volunteers, or does contract work on site for a cultural heritage-related organization in the United States. Available to take in English, Spanish, and Simplified Chinese! The purpose of this survey is to gauge self-assessed needs and preparedness for immigration enforcement (or "ICE") encounters at GLAM-sector workplaces. (GLAM is short for "Galleries, Libraries, Archives, and Museums" and includes a spectrum of related organizations.) The results from the survey will be used internally to help the Cultural Heritage Advocacy and Action Coalition (CHAACo) <https://www.chaaco.org/> tailor our efforts <https://www.chaaco.org/resource-hub/immigrants> to serve the urgent needs of cultural heritage communities in the United States. For your privacy, this survey is anonymous and end-to-end encrypted, hosted via CryptPad.org, an open-source encrypted platform. To ensure your anonymity, we do not request names, email addresses, personal identity-based information, or other uniquely identifying information, and we do not collect IP addresses. If we come to believe that any submitted answers are personally identifying or provide information about undocumented status, we will anonymize or delete those specific answers in our records within one month of discovery. While CHAACo may share insights gained from the survey, for the safety of our communities, full data sets and complete written answers will not be published. For more information about the survey, visit our Survey page <https://www.chaaco.org/resource-hub/immigrants/ice-survey>. Please submit your response by the end of September to help us understand if designing a training program will best serve you, and what to focus on! We will continue to accept rolling submissions to inform our ongoing work, but your impact will be greatest now. Take the ICE Preparedness Survey <https://www.chaaco.org/resource-hub/immigrants/ice-survey> And please, help us circulate this survey to your coworkers across all teams. We want to hear from everyone: collections specialists, janitors, exhibit designers, security guards, directors, café staff, docents, greeters, gardeners, and more! Thank you! CHAACo's Immigrant Solidarity Survey Team Cultural Heritage Advocacy and Action Coalition www.chaaco.org <https://www.chaaco.org> ------------------------------ Katherine Langdon Conservator The Walt Disney Family Museum San Francisco United States ------------------------------ You are subscribed to "Global Conservation Forum (ConsDistList)" as [email protected]. To change your subscriptions, go to http://community.culturalheritage.org/preferences?section=Subscriptions. 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