Natural Indigo - is an extract prepared from cultivated plants of Indigofera Tinctoria. Indigo is the only source of blue in the plant world. Its ability to produce a wide range of blues has made it the most successful dye plant every known. Indigo grows all over the world but flourishes best in hot, sunny, humid areas. Indigo can give the clearest blues of all values from pale sky blue to the deepest darkest navy. Our indigo comes from a farm in South India and is very strong and reduces beautifully in an indigo vat.