Indigo dyes: These dyes contain the carbonyl chromophore. Indigo is the oldest dye.
![726_indigo dye.png](https://www.expertsmind.com/../CMSImages/726_indigo dye.png)
Another indigo dye is royal blue in colour which is dibromo derivative of indigo. It is known as Tyrian blue.
![452_indigo dye1.png](https://www.expertsmind.com/CMSImages/452_indigo%20dye1.png)
- 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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