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Old December 15th, 2014, 04:51 PM   #3
Filiberto Boncompagni
Join Date: May 2008
Location: Cyprus
Posts: 93

Alas, your supposition is wrong, Pierre. I had to reach for my old books on the chemistry of restoration.
I found that natural Alizarin was the main component of the lacquer “Lacca di Robbia” (a.k.a. Madder Lake, Garanza, Rose Madder), it was used since ancient Egypt and, besides being quite stable, like all organic colorants was sensible to light.

“Alizarin Crimsom” was the name for the artificial variety used since the half of the 19th century and, yes, it had more stability and light fastness than the natural Madder Lake.

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