One of the mysteries of the English language finally explained.
A dark blue crystalline compound which is the main constituent of the dye indigo.
- ‘In 15 samples, carminic acid was found in combination with indigotin.’
- ‘The indican is oxidized to form the deep blue indigotin.’
- ‘Indigotin (from woad) was used in conjunction with other dyes to produce several purples (with madder) and a green (with the unidentified yellow).’
Mid 19th century: from indigo + -t- (for ease of pronunciation) + -in.
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