This is a result of my investigations into substitutes for alizarin crimson. I've been using Mark's pyrrole rubine (pr-264) and also the Winsor Newton permanent alizarin (pr-177 anthraquinone red) and I like them both. I've been making my paints and want to make these two up to decide which to use permanently.
I found a source for the PR-177 at Kama Pigments, but am having difficulty finding a source for buying Pr-264.
By the way, I bought some M Graham Pyrrole Red thinking it was the same as Mark's. Is is NOT the same. It is PR-254 and is opaque where PR264 is transparent! Checking on Dick Blick, I found that Holbein makes one using pr264 that they call pyrrole rubine transparent and that there are a couple of other manufacturers that use pr264 but give it a different name.
Does anyone know where I can but the PR-264 dry pigment in relatively small quantities?