Since these are sold as the sodium salt, they form such a large anion in the aqueous medium.
Acid dye properties are discussed below –
These dyes are anionic in nature.
These dyes are perfect for silk, wool, modified acrylics, and polyamide.
These are applicable from the strong acidic to neutral pH bath.
These dyes have no affinity for cotton cellulose, hence it is not suitable for cellulosic.
These dyes combine with fiber by the hydrogen bonds, Waals forces, or via ionic linkages.