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The Roman mythographer Julius Pollux, writing in the 2nd century AD, 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.
In 2012, Kellogg's introduced Froot Loops to the UK market for a limited time with only the secondary colors (orange, green, and purple), as natural color substitutes for red, yellow, and blue could not be found. The recipe also differed from the US version.