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Сообщение от Cyril Syzransky
But most likely it is visible light soil. Apparently, the artist has used a primed canvas, the factory primer. In this case, the soil could not darken over time.
You're not talking about the color of the back side you ask, according to the fragment shown you?
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Yes, thanks, of course, I meant the white gaps between the paint and rims of the front. I guessed that this primer, only never seen such white in old paintings. Experience certainly lacks: (Y icons too white gesso, but it is under the paint, but on an overhead darkens all: p