They are not soluble in water and hence they cannot be
applied directly on textile like direct dyes. They have to temporarily convert
into a water soluble form, which must have higher affinity to cotton than its
water solubility and then applied to cotton at an appropriate temperature and
then heating the solution while stirring the yarn so that it picks up the dye
uniformly to give even dyeing effect. Finally the water soluble form should be
reconverted into the original insoluble form after being taken up by the
cotton. This dye has good washing fastness. They will not bleed out in the hot
soap solution used in washing of the dyed clothes.
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