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What is "polychroite"

The Collaborative International Dictionary
polychroite

Crocin \Cro"cin\ (kr?"s?n), n. [Gr. ???? saffron.] (Chem.)

  1. The coloring matter of Chinese yellow pods, the fruit of Gardenia grandiflora.
    --Watts.

  2. A red powder (called also polychroite), which is made from the saffron ( Crocus sativus). See Polychroite.

Wiktionary
polychroite

n. (context chemistry English) The coloring matter of saffron; -- formerly so called because of the change of color on treatment with certain acids; -- called also crocin, and safranin.