The Paris Review - A Brief History of Ultramarine—The World's Costliest Color
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Today I realised that ultramarines are named after a colour and not because their the marines that are ultra, please tell me I wasn't the only one who thought this. : r/Warhammer40k
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Ultramarine - Wikipedia
Do you, personally, consider Ultramarine to be a shade of purple, or blue? Why? - Quora
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