Dear all conservators and restorers,
My name is Qing Wu. I am a Master student, studying Conservation and
Restoration in the Bern University of Arts (HKB), Switzerland. I am currently
having a Master project, focusing on applying different analytical methods to
investigate the foil structure and chemical state of Zwischgold/Part-gold. The
purpose of this project is to provide scientific foundation for the evaluation
of possible conservation/restoration treatments for Zwischgold. In order to
successfully implement my project, I would like to ask you to do me a favour by
filling a simple survey (4 questions) about the conservation of Zwischgold.
Your kind help will be greatly appreciated.
Firstly I would like to give a short introduction about the background of
Zwischgold and the scientific scope of my research:
"Zwischgold" (DE) or "part-gold" (EN) is commonly regarded as an economical
alternative for gold leaves, which was historically applied to gilded artworks
such as altars, sculptures and panel paintings. Normally, it was applied to
less prominent areas such the gown folds of figures, rear side of altars and so
on. Sometimes they were also used for specific areas such as the hair of
figures due to its unique cold color tone comparing to pure gold. In this
Master thesis, the research scope is restricted to two-sided metal foils that
were made by adhering a gold leaf over a silver leaf with the cold welding
(German: Kaltverschweissung) techniques. Without a varnish protection layer,
these foils tend to corrode quickly in air, causing a darkened surface and
gloss loss. However, after hundreds years' aging, some of the varnish layers
can't provide proper protection anymore and thus we see darkened Zwischgold
surface on art objects quite often. In the meanwhile, well preserved Zwischgold
bjects also exist everywhere, making it difficult to differentiate from gold
Here are the questions:
1. How do you identify Zwischgold in its aged status (darkened surface) and
also in its well-preserved status?
2. Have you ever applied any conservation and restoration treatment for
darkened Zwischgold surface? If yes, what is it and how did you do it?
3. Have you done any scientific investigation about Zwischgold? If yes, what is
it and have you gained any interesting result?
4. Would you like to participate in this Zwischgold project in future?
Collaboration is always welcome!
Thank you very much for your time and effort again!
With best regards
Master student in the Atelier of Painting and Sculpture (GUS)
Bern University of Arts (HKB)
Unsubscribe by sending a message to consdistlist-le...@cool.conservation-us.org
Archives through August 2016 at
Archives from September 2016 onward at