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Originally Posted by Richard Monro
Michelle,
For instance, copal is a varnish not a drying medium, and copal has its own special archival concerns. Mayer's research will set matters straight for you.
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True, but I suggested this medium as an example of a medium that has been around for generations, and also speeds drying. Ron is second generation maker of this stuff and I believe that it is made from the recipe and production process that Taubes employed and passed down to his students. There is however the difference of a less hard copal available today as compared to the original. In my experience it will accelerate drying, usually I can over paint in a day or two. But I live in the southwest and everything drys faster here, plus I usually use a lead white. Also of note on this stuff, It is a cooked combo of copal resin, stand oil, and turpentine. If you are sensitive to turps you will want to avoid it.
Just my opinion
Peace,