Dear Oh, It could be mold, which can be determined more accurately through laboratory analysis However, it could also be salts, where I am aware of residues (efflorescence) from old biocides. But not on metal, more on wood or other materials.
>From which part of the world is your museum? Are there high humidity in the >room? Definitely something for the lab, as visual assessment via photo is always difficult. Best, Stephan IPM expert and Consultant Germany -----Ursprüngliche Nachricht----- Von: [email protected] <[email protected]> Im Auftrag von JOONSUK OH Gesendet: Sonntag, 8. März 2026 06:55 An: [email protected] Betreff: [PestList] Help White substance of metal surface Hello I found white substance on the surface of metal object in storage room of museum. What is white substance ? Is this white substance mold? Thank you Oh, Joonsuk Managing Director Conservation R&D Center Thinkpeople Co. Ltd. -- This PestList and the MuseumPests.com web site are made possible due to the talent, intelligence, devotion and donations of hundreds of volunteers. Your donation to help this resource continue would be greatly appreciated. Please consider a donation donating at https://givebutter.com/MuseumPests To unsubscribe from this group, send email to [email protected] --- You received this message because you are subscribed to the Google Groups "MuseumPests" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/pestlist/24c64fa6-798c-4693-96e5-310a0843bc2c%40gmail.com. -- This PestList and the MuseumPests.com web site are made possible due to the talent, intelligence, devotion and donations of hundreds of volunteers. Your donation to help this resource continue would be greatly appreciated. Please consider a donation donating at https://givebutter.com/MuseumPests To unsubscribe from this group, send email to [email protected] --- You received this message because you are subscribed to the Google Groups "MuseumPests" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion visit https://groups.google.com/d/msgid/pestlist/AM7P189MB1137A3F04C1A96247ECB921ECA78A%40AM7P189MB1137.EURP189.PROD.OUTLOOK.COM.
