Persian blue

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Persian blue comes in three major tones: Persian blue proper: a bright medium blue; medium Persian blue (a medium slightly grayish blue that is slightly indigoish); and a kind of dark blue which is referred to as Persian indigo, dark Persian blue, or regimental, that is much closer to the web color indigo.

Excerpt from the Wikipedia article “Persian blue”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Diego Delso, CC BY-SA 4.0, via Wikimedia Commons.