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nature : orange powder. Cold water-soluble and insoluble in water was brown, by adding sodium hydroxide was purple blue. Mainly for the dyeing of wool fabrics, especially applicable to the top, wool dyeing. By 2-hydroxy-3-methyl-benzoic acid and 2,6 - dichlorobenzene formaldehyde condensation, and then oxidation, alkali fusion, salt and Analysis prepared.
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