Indigo dyes: These dyes contain the carbonyl chromophore. Indigo is the oldest dye.
Another indigo dye is royal blue in colour which is dibromo derivative of indigo. It is known as Tyrian blue.
- Common 'Neel' used as a blueing agent in laundry to remove yellowish tint on white clothes or in whitewashing is not indigo. It is ultramarine blue - and inorganic substance silicate of aluminum and sodium with about 13% sulphur.
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