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manganese naphtanate


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David, do you use powdered colophony or processed violin rosin? How do you pre-treat these?


Originally posted by David Tseng:

From my experience, the catalyst is not needed if there is sufficient light and air (I probably still have that staff somewhere in my garage). I made the resin some 20 years ago, I don't use it any more. Now I use amber and rosin.

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Down here in Johannesburg I found rosin and gum turpentine at a company that buys chemicals in bulk and re-packages it in smaller containers - at a considerable markup of course, but a lot cheaper than any hardware store or artist supply store.

Look in your local yellow pages under chemical suppliers and try to find a reference to 'repacks'. If you are lucky they might even have manganese naphtanate.

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