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2In the same way an excellent purple is obtained by preparing vaccinium, and mixing it with milk. So also, those who cannot afford the use of chrysocolla, mix blue with the herb weld, and thus obtain a brilliant green. These are called factitious colours. On account of the dearness of indigo, Selinusian chalk, or that used for making rings, is mixed with glass, which the Greeks call ὑαλος; and thus they imitate indigo.
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