The dye content of polyester fibers on fiber blends containing both disperse and cationic dyes is determined by extracting the disperse dyes with chlorobenzene, followed by extraction of the cationic dye with DMF containing 55 g/l. ZnCl2, 8 ml/l. conc HCl (37%), and 20 g/l. 2,6-di-t-butyl-4-methylphenol.
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