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The effects of nitric acid and nitrous acid on the color variations of aminoanthraquinone and azo dyes on cellulose film were examined. The immersion of dyed films in an acidic aqueous nitrite solution led to color variations caused by the diazotization of the amino groups in the anthraquinone and azo reactive dyes examined in addition to the dye–fiber bond scission by acid hydrolysis. When the dyed...
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