Acid Dye

Also known as anionic dyes, it can combine with amino groups in protein fiber molecules by ionic bonds, and is suitable for acidic, weakly acidic or neutral conditions. Mainly are azo and anthraquinone structures, and a few are aromatic methane structures. Dyestuffs and colors are generally compounds that have their own colors and can make other substances obtain bright and firm colors in a molecular or dispersed state.
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Acid Red Dye, Acid Black Dye, Acid Orange Dye