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The azo dyes that are restricted for textile use have been so restricted because they cause skin hypersensitivity and Allergies. Not all azo dyes are so restricted--there are eleven azo dyes that are approved for use in food.

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Q: Why azo dyes are resticted for textile dyeing printing?
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Azo food dyes don't set off allergic reactions as such, though some azo textile dyes can cause your skin to be hypersensitive. The mechanism for why tartrazine increases allergic reactions is not yet known.

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