Acid dyes are water-soluble, anionic dyes primarily applied to textiles at low ph. The term “acid dye” comes from the dyeing process, which is carried out in an acidic medium (ph around 2–6) using mineral or organic acids such as sulphuric, acetic, or formic acid. Most acid dyes are sodium salts of organic acids, giving them their anionic nature. Under acidic conditions, they are strongly attracted to positively charged amino groups in fibers like wool, silk, and nylon, resulting in brilliant and uniform coloration.
The key property of acid dyes lies in their interaction with fiber polymers, leading to a strong bond between the dye and the material. This happens through an ion-exchange mechanism, where ionic bonds form between the cationic groups in the fiber and the anionic dye molecules (such as sulphonate groups). Along with ionic linkages, acid dyes may also bind through hydrogen bonding and Van der Waals forces, ensuring excellent color strength and brilliance.
Applications:
Key Properties of Acid Dyes:
Product Range:
Our Acid Dyes are available in a wide spectrum of shades, delivering: