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Martius yellow and congo red are examples of which types of dyes?

$(a)\;\text{Disperse dyes} \\ (b)\;\text{Vat dyes} \\(c)\;\text{Mordant dyes} \\ (d)\;\text{Direct dyes} $

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Since martius yellow and congo red are directly applied to the fabric from their aqueous solutions.
They are very effective for dying cotton, rayon,wool.
Thus its a Direct dye.
Hence d is the correct answer.
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