Example of basic dye is:

alizarin

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indigo

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martius yellow

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malachite green

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Solution

The correct option is A alizarin
Basic dye is a stain that is cationic (+ve charged) and so will react with material that is (-ve) negatively charged. Alizarin prominent red dye is a basic dye. Some other examples of basic dyes are methylene blue, crystal violet, basic fuchsin safranin.

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