对称重氮化合物，含有它们的组合物，染色方法和设备。
Symmetrical diazo compounds, compositions comprising them, method of coloring, and device.
蒸馏是去除重氮化合物、2萘胺1磺酸干扰的有效方法。
Distillation is effective to remove diazo compound and 2-naphthalin-1-sulfonic.
特殊阳离子重氮化合物，含其作为直接染料的组合物，角蛋白纤维染色方法及其装置。
Cationic diazo compounds, compositions comprising them as direct dye, process for dyeing keratin fibers and device therefor.
特殊阳离子重氮化合物，含其作为直接染料的组合物，角蛋白纤维染色方法及其装置。
Cationic diazo compounds, compositions comprising them as direct dye, process for dyeing keratin fibers and device therefor.
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