Alizarin belongs to the class of:

vat dyes

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mordant dyes

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substantive dyes

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reactive dyes

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Solution

The correct option is D mordant dyes
Alizarin belongs to the mordant type of dyes. It is a red dye originally obtained from the root of the common madder plant, Rubia tinctorum, in which it occurs combined with the sugars xylose and glucose.

It is mainly used in biological research. It stains free calcium and certain calcium compounds with a red or light purple color.

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