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Dear Margaret,
You might be lucky and be able to remove the varnish without damaging the painting. If it hasn't been on too long, it might work. If we are truly growing in our art, we have a tendency to want to take ALL our old work to the dump. We are all a little crazy this way.
Gamvar:
I've found I don't have to be too diligent in the Great Gamvar Shake Up department. I pour the solvent in the crystals bottle and forget it for a day. When I come back, I find it completely dissolved. I shake it a bit then. If I can do it, it means it isn't hard to do.
Damar will yellow over time. No doubt about that. However, I suppose paint pigment would mask that completely. My gripe with damar in a paint medium is that it becomes sticky fast and is hard to manipulate. If I need an additive medium, I prefer to use oil only, or oil with a little mastic.
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