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Colour Index (CI)

The colour index (CI) developed by the Society of Dyers and Colorists, is used for dye classification.

pH scale

pH Scale is a term used for reporting acidic or alkaline quality of a liquid.


Yarn-dyed is a term used to describe fabrics produced with yarns already dye prior to the weaving process.


Sulphur is a type of dyestuff used frequently on blacks, and neutrals khaki’s while economic has only moderate fastness to washing and light.

Synthetic Dyes

Synthetic dye. In 1856 William Henry Perkin, an English chemist discovered the synthetic dye Mauveine. From this day forward, synthetic dyestuffs began to supplant natural colour — the synthetic-dye manufacturing industry founded by Perkin in 1857.


Range-dyeing is a process in which yarn runs through an indigo dye, then the colour fix by exposing it to air. This allows the fabric to fade gradually.


Oxidation when oxygen and another substance chemically join; it occurs when the indigo yarn comes out of the indigo bath between dips and is critical for the dyestuff to penetrate the fibre.