Sunshine Challenge 2020: Prompt 6 - Indigo

This prompt for the Sunshine Challenge is indigo.

Indigo is a perplexing color. Is it blue? Is it purple? I know it lies somewhere between the two, but I had to look it up to make sure I have the right shade in my head... and I'm still confused. At least Isaac Asimov seems to agree: "It is customary to list indigo as a color lying between blue and violet, but it has never seemed to me that indigo is worth the dignity of being considered a separate color. To my eyes it seems merely deep blue."

For a fandom association, I'll go with Rarity from My Little Pony: Friendship is Magic. The color of her mane appears to fall in the blue-violet spectrum, and even if I'm wrong, I know she could tell me all about indigo and how to pair it tastefully with other colors.

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