Which of the following is a direct dye – InterviewSolution

1.	Which of the following is a direct dye
Answer» Phenolphthalein Congo red Alizarin Indigo Solution :DIRECT dyes stick to the fibre through hydrogen bonding. They belong to the class of azo dyes. They are USED to dye the fabric DIRECTLY by placing it in aqueous solution of dye e.g. martius yellow, Congored ETC.

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