The use of Dimethylformamide-Trichloroethylene (DMF-TCE) as a solvent-nonsolvent mixture is suggested for the purification of acid and direct dyes of varying degrees of sulphonation. The dye purity was varied from 93% to 100% as indicated by the sodium analysis of the purified dyes. In addition to TCE the feasibility of various other solvents as precipitating agents was also qualitatively tested.
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R B Chavan (1976) studied this question.
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