Indigo belongs to the class of

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(B) $Indigo$ belongs to the class of $Vat$ dyes.$Vat$ dyes are insoluble in water and must be reduced to a soluble form (often called the $Leuco$ form

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Vat dye

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(B) $Indigo$ belongs to the class of $Vat$ dyes.$Vat$ dyes are insoluble in water and must be reduced to a soluble form (often called the $Leuco$ form) in an alkaline medium to be applied to the fabric.Upon oxidation (usually by exposure to air),the $Leuco$ form is converted back into the insoluble,colored pigment within the fiber,ensuring excellent wash fastness.

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