alkannin

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al·kan·nin

(al'kă-nin), [C.I. 75530]
The major red dye derived from alkanet; used as an astringent, in cosmetics, and foods; can be used as an indicator: red at pH 6.8, changing to purple at pH 8.8 and blue at pH 10; also used as a fat stain.
Synonym(s): anchusin
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