Dosing station for dyeing auxiliaries

Dosing station for dyeing auxiliaries

Dosing station for dyeing auxiliaries
Indigo belongs to the group known as vat dyes. These dyes are typified by the fact that they do not form a chemical compound with the yarn, instead adhering to its surface as a surrounding pigment. Hydrosulphite (dithionite) is used as an auxiliary material when dying cotton with indigo (e.g. denim). It turns the water-insoluble blue colour indigo into a water soluble light-yellow leucoindigo (indigo white). This process is referred to as vatting.
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