Which is the correct colours occurs by "congo red"?
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Congo Red is an indicator dye that is blue-violet at pH 3.0 and red at pH 5.0.
Description: Congo Red is the sodium salt of benzidinediazo-bis-1-naphthylamine-4...
Synonyms: Congo redDIRECT RED 28573-58-0C.I. Direct Red 28Benzo Congo Re...
Parent Compound: CID 11314 (3,3'-(Biphenyl-4,4'-diyldidiazene-2,1-diyl)bis(4-amin...
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Congo Red is an indicator dye that is blue-violet at pH 3.0 and red at pH 5.0.
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