The present disclosure relates to compounds used as direct dyes, and dyeing compositions comprising such compounds. The disclosed compounds have the formula A-L-B, wherein A and B are chosen from arylazoimidazolium coloring functional groups, and L is a linker comprising at least one cationic group C. The disclosure also relates methods of using such compositions for coloring keratin fibers, such as the hair.
                            本公开涉及用作
直接染料的化合物,以及包含这种化合物的
染料组合物。所公开的化合物具有公式A-L-B,其中A和B选自芳基偶氮
咪唑阳离子染色功能团,L是包含至少一个阳离子基团C的连接剂。该公开还涉及使用这种组合物为染色角蛋白纤维(如头发)的方法。