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In this post I wanted to do a shout out to the color indigo because in my opinion it is the forgotten color of the rainbow. Now even though this picture is a little more violet than indigo I want to educate you on the color indigo (it was the closest thing I had to indigo so just use your imagination). Indigo is the hue that is between blue and violet, it has wavelengths of approximately 420-450 nanometers. Some of the other colors approximate wavelengths include:

Red        630-750

Orange  590-630

Yellow   570-590

Green    490-570

Blue       420-490

Violet    380-420

If you want check out a nice indigo image check out this link, the image in this link is not mine. So if you want to sound a little more educated you can identify things that are truly indigo and not violet, blue, or purple.