Asian Journal of Chemistry 14 1 , The Analytical Chemistry of Synthetic Dyes Data on fastness properties of light, wash and rubbing are shown in Table 4. Melting points were determined in open capillaries and are uncorrected. Various hot brand bis azo reactive dyes based on 4,4'-methy-lene-bis-metanilic acid have been synthesized. The dyes were applied on silk, wool and cotton fabrics and their fastness properties were evaluated.
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