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

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

Jeans manufacturers make denim bluer with indigo dye.

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

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

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

Indigo blue is one of Japan's traditional colours.