We find it in fancy decorative paints used in old theaters. It was still used in the 1920s. And artist's paints used it a lot longer. Here in NYC in the 1990s, I could tell you who to contact for the pigments if you wanted to buy them. I assume smart internet users can still get them.
From: Mark Ellison <Mark**At_Symbol_Here**TANKTRAILERCLEANING.COM>
To: DCHAS-L <DCHAS-L**At_Symbol_Here**PRINCETON.EDU>
Sent: Fri, Jul 13, 2018 3:33 pm
Subject: [DCHAS-L] Arsenic
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