Indigo

 Indigo - the oldest dyes derived from raw tropical plant Indigofera tinctoria. First emerged several thousand years ago in ancient Egypt. Paint the deep blue hue perfectly kept on the fabric. For a long time indigo is extremely rare and expensive dye. In 1882, organic chemist and Nobel laureate Adolf Bayer received an artificial analogue of indigo. Since ancient times, the dye used to color fabrics and objects as well as the body.