The ancient Phoenicians discovered that a particular species of sea snail, called Murex, could be used to make a vibrant purple dye. But it was so labor intensive - requiring thousands of snails just to dye a single garment - that only the wealthiest people could afford it. This is why purple became known as the “color of royalty.”

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“Purple with ill-smelling dye”: The river in Coketown in Charles Dickens’s “Hard Times” (1854)

The Coketown canal in Charles Dickens's "Hard Times" (1854) is "purple with ill-smelling dye." Purple dyes were among the first synthetic dy...