Robuta

https://www.cottonwoven.com/product/tannin-blend-100g-3-6-oz/ Tannin Blend 100g (3.6 oz.) - Cotton Fabrics with Natural Comfort, Breathability, Color Variety,... Tanninis used to assist the mordants of cellulose fibres and fabrics. Alum does not bond with cellulose fibres as well as it does with protein fibres. However,... tannin blendcotton fabricsoznaturalcomfort