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Why NOx gas fastness is carried out for reactive dyes?

dyes fastness Gas nox reactive
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Why NOx gas fastness is carried out for reactive dyes?

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A. Major source of Nitrogen Oxide is automobile exhaust. Cotton products dyed with reactive dyes can suffer fading due to these gases. Nitrogen oxides are responsible for change in colour due to nitrosification of the amino group in the dyestuff molecules.

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