Indigo

Jeans manufacturers make denim bluer with indigo dye.

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

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

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

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

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

Indigo blue is one of Japan's traditional colours.

Blue was a rare, expensive color in ancient times, whether it was derived from lapis lazuli mined in Afghanistan some 6,000 years ago, made by blending copper with other elements throughout the Middle East and in ancient China, or mixing an extract of the indigo plant with clay and resin by Mayans in Mesoamerica.

There are seven colors in the rainbow: red, orange, yellow, green, blue, indigo, violet.

The night was considerably clearer than anybody on board her desired when the schooner Ventura headed for the land. It rose in places, black and sharp against the velvety indigo, over her dipping bow, though most of the low littoral was wrapped in obscurity.