Cǎihóng zhōng de diànsè jiā zài lánsè hé zǐsè zhījiān.
Indigo in the rainbow sits between blue and violet.
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history
The character 靛 originally referred to dye made from 蓼蓝 (knotweed indigo), a plant used in China for over two thousand years. The chengyu 青出于蓝 ('blue comes from indigo') refers to this same dye process.
