Up to the middle of the 19th century there were only natural dyes, and most of these were vegetable origin; natural indigo being one of the more important dyes. Natural dyes to usually have no affinity for textile fibres until the fibres are treated with aluminum, iron, or tin compounds to receive the dye (Mordanting). This is a problematic process, and the dyes in any case have poor fastness to sun or abrasion.
TEXTILE DYE OVERVIEW
ECO-FASHION-DENIM AND DIAGRAMS DICTIONARIES OVERVIEW