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Originally Posted by Garth Herrick
. . . I was told by Steven Salek, who makes the paint, that the pigment (PR83), is madder derived, in this case. . .
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Chemically, PR 83 is derived from anthracene, a coal-tar derivative. Possibly he meant that their choice of material in this instance "derives" from satisfying their idea of a "match" for genuine madder?
Most colorsts' offerings are "signature" and this is more true of small "boutique" makers. Vasari makes excellent paint IMO.