Assertion: purple dye | /r/HasProperty | discovered by his dog
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text: The Roman mythographer Julius Pollux, writing in the 2nd century CE, asserted (Onomasticon I, 45–49) that the purple dye was first discovered by the philosopher Heracles of Tyre, or rather, by his dog, whose mouth was stained purple from chewing on snails along the coast at Tyre.