Indigofera Tinctoria A great way to get started. This kit is used for the 'Fruit Vat' the 'Banana Vat' and 'Fructose Vat'. This kit contains 50g natural indigo, 125g fructose, 125g calx, and instructions. Indigo is the legendary source of colourfast blues and its ability to produce a wide range of shades has made it the most successful dye plant ever known. Indigo grows all over the world but flourishes best in hot, sunny, humid areas. Indigo can give clear blues that range from the tint of a pale sky to a deep navy that is almost black.