A rainbow consists of red, orange, yellow, green, blue, indigo and violet.

Jeans manufacturers make denim bluer with indigo dye.

I had never seen an indigo bunting until I moved here.

I can't remove the indigo dye in my hair!

I'm not able to remove the indigo dye in my hair!

Indigo blue is one of Japan's traditional colours.

The visible colors of the rainbow are red, orange, yellow, green, blue, indigo, and violet.