How was the blue colour produced in 18th century ?
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the blue colour was produced through cultivating indigo plants
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In eighteenth-century England, blue mainly came in the form of ultramarine, cobalt-based blue pigments, and woad (Isatis tinctoria), with azurite having been replaced by so-called “blue ashes” (Delamare 181). ... Artificial and cheaper ultramarine was later invented by Jean-Baptiste Guimet in 1826.
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