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Linear isotherms have been obtained on. viscose rayon, in the range 20‐90d̀C, with benzidine, o‐ and m‐tolidine, and derivatives of aminoazobenzene. o‐Tolidine has much higher affinity for cellulose than the non‐coplanar m‐tolidine. Heats of dyeing were found to be constant between 40 and 80d̀C. Non‐ionic dyes do not appear to form aggregates in aqueous solution.
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Aspland et al. (1961) studied this question.
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