Which one is an acidic dye ? – InterviewSolution

1.	Which one is an acidic dye ?
Answer» Methyl orange Methyl red Phenolphthalein All of these Solution :ACID dyes are charactertised by the PRESENCE of -COOH, -`SO_(3)H` or Phenolic group. They are applied in the presence of acidic solution. They are usually applied to WOOL, SILK, Nylon. They have affinity for cotton. Common examples are Orange I, Orange II, Methyl red etc.

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