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Azolitmin and erythrolitmin, alkaloid, lecanoricacid, orcein, erythrolein are the main parts of the litmus.

Phycocyanin is the main part of the spirulina blue color.It is protein combined pigment,has the same character with protein.

Indigo color is absolute a natural pigment abstracted from the leaves of Polygomum tinctorium Lour e.g. blue Polygonum,blue tea, Strobilanthes cusia, woad by modern biotechnology.

Gardenia Blue It is a kind of natural edible pigment extracted from rubiaceous plant gardenia fruit. The main compositions are crocin and cricetin of series of carotinoid pigment. The powder from light gray to smalt is soluble in