A) Phenol
B) Aniline
C) Congo Red
D) Eosin
Correct Answer: D
Solution :
Red inks usually contain the dye Eosin. Eosin is a group of fluorescent acidic compounds that bind to form salts with basic or eosinophillic compounds like proteins containing amino acid residues and stains them dark red or pink colour under the action of bromine or fluorescein.
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