Some example are indigo, from the indigo plant, and Tyrian purple , the imperial purple the Romans prepared from a shellfish native to the Mediterranean.

例如靛蓝，来自靛蓝色植物。泰尔紫也叫帝紫，古罗马人从原产于地中海的贝壳类动物制作的。

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The Phoenicians were there first, sailing from the relative safety of the Mediterranean into unknown ocean waters off Morocco in search of the Murex snails used to make imperial purple dye.

ECONOMIST: The Atlantic Ocean