Indigo Powder All Natural - Kosher Origin: China. INCI: Baphicacanthus Cusia (Nees) Bremek Powder. This stunning blue powder is a natural colorant that's extracted from the leaves and stems of indigo-containing plants. Traditionally used in China as a medical remedy more common applications make use of it as a natural dye. Add this colorant to any of your favorite soap projects for a blue just like that of blue jeans.