Acid Blue 9, also known as acid brilliant Blue, is an artificially synthesized organic dye with extremely strong chromaticity. It can be dyed in a large vat of water with just a small amount. This pigment was originally used to dye fabrics, and later widely used in washing, daily chemical, food industry and other fields.

In toilet cleaning product, Acid Blue 9 is mainly used as a coloring agent.

The blue warning agent in toilet cleaner is generally the universal acid blue 9. There are two main reasons for adding acid blue 9. Firstly, blue always gives a refreshing feeling, as it can mask the yellow brown color of toilet urine, making the cleaned toilet look cleaner and fresher. Secondly, Acid Blue 9 can also serve as a warning color. If toilet water flows back to the faucet, people can immediately notice it, as blue water contrasts sharply with the usual colorless or light yellow tap water.

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