Acacia catechu) is derived from the heartwood of the Acacia tree. It is high in tannins and works well on both cellulose and protein fibers. Cutch on it's own is a lovely warm brown, and works very well in combination with iron (dark brown) and cochineal (chocolate brown). Cutch is a weaker dyestuff, we use it at up to 20% for dark shades, and 8-12% for light to medium shades.
This is an extract, which will dissolve in hot water.