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Michael,
In conversation with another Fine Artist who has much more experience in the area of pigments, copals and so on. I was told that as far as he knew , there are no in-house - pigments manufacturers for artists.
I guess for commercial tube users, it's pot luck. (Remember the great Rembrandt Lead White discussion at Rob's, and the possibility that Old Master Lead White was coarser and less reactive in Oil than today's Lead White?)
I can tell you, if you had the time to look it up, treatment of pigments before being used in paints, are listed. This one of the reasons, why one shouldn't add to many odd ingredients into mediums and then into paints.
Oh, by the way Einion [Title - Paint Making ], on the other forum, left a link to the National Gallery. If you can get into the search section of the site. Vol 22 of the NG technical bulletin has the answer your looking for on Venice Turpentine, in the Article on Varnishes of the 19th century. Good Reading.
Khaimraj
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Khaimraj
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