Anthraquinone dyes, RUBIA, RUBIA CORDIFOLIA (INDIAN MADDER) 0 0 1,3-Dihydroxyanthraquinone aka purpuroxanthin or... by All This 2 years ago
Anthraquinone dyes, Cobalt, RUBIA, Seeing Red, Yellow 0 0 1,2,4-Trihydroxyanthraquinone aka purpurin by All This 2 years ago
by 