Stanka,
First of all it ruined my brushes. Also, I have discovered that there are many unanswered questions concerning the long term effects of alkyd resins.
I found a technical journal published by the National Gallery in London. This particular issue dealt with the analysis of works created by Van Dyke and Rubens. Using the most technically sophisticated scientific techniques conservators examined the works of these two great artists. They discovered that the only medium present was linseed oil.
In the vast majority of paintings painted before the 18th century analysis has found nothing other than vegetable oils in the paint film. These paintings have held up far better than paintings painted hundreds of years later that used more sophisticated combinations including resins, black oil or what have you.
It is always possible that at some point in the future scientists will invent a test that may discover the presence of additional additives but until then I'm sticking with my linseed oil.
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