Allan, we're comrades in arms! I've been mulling my own white lead for several years, because I couldn't find a flake white that "worked" like what I was used to years back.
Mull your white lead in the black oil . . . I think you'll really like it!
You're right . . . biggest problem re-using the dregs is how to measure the quantity. That may not be much of an issue, since only a certain amount of litharge will go into solution in the oil anyway. ?? I don't know, but I'm inclined to try it. We'll have to keep in touch on this.
It only takes a single drop of water for a spoonful each of black oil and mastic to hasten the gelling process. Emulsions are something I've been promising myself to try, but haven't yet.
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