Mike_Danielson Posted May 12, 2022 Report Share Posted May 12, 2022 Varnish making is simple and inexpensive if you use a recipe like Hargrave's. Cooked flaxseed oil with a resin (colophony, for example) has been used for centuries, and they have a known track record. See Mrs. Merrifield's book. The uncooked rosinate varnishes like Michelman's are a failure. This is well established. The long term performance of cooked rosinate varnishes is unknown. And I suspect they are very hard (not as flexible) as the Hargrave-like oil varnish. Long term stability of the color is also an unknown--all that iron in the iron rosinate could be a problem, and use of madder has a well-known problem with color stability. I would worry that the varnish will eventually alligator or breakdown as in flaking. ASTM has published methods for rapidly testing varnishes for long term performance--this should be done to this new type of instrument varnish to help establish some kind of confidence. But maybe, because you guys are "pure of heart and say your prayers by night", these potential shortcomings will not occur. Mike D Quote Link to comment Share on other sites More sharing options...
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