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Question asked 2022-03-18 14:09:55 ... Most recent comment 2022-03-20 15:31:42
Art Conservation Topics Oil Paint Scientific Analysis Technical Art History

Just read this article and thought it would be interesting for you all here:

https://arstechnica.com/science/2022/03/shining-an-infrared-light-on-how-metal-soaps-threaten-priceless-oil-paintings/



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User Comment

[2022-03-20 15:31:42]

​There were a few studies on this.  I'm not absolutely sure, but I think it might have been Yonah Maor 2008 who mentioned that when zinc white and lead white are mixed in drying oils.  That zinc metal soaps are preferencially formed over lead ones.  Which might explain why a sample of green paint containing lead white had no zinc white in it, but had zinc metal soaps.  Relating to this is the speculation that an area of paint of a work in Sydney Austrialia.  The small percentage zinc white was believed to have completely reacted away leaving only metal soaps.

Marc.​

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