Acid red 88

Due to its intense colour, solid samples appear almost black.

It can be obtained by azo coupling of naphthionic acid and 2-naphthol.

Instead of crystallising, it vitrifies when cooled or salted out of the solution.

This compound is used in the textile industry as a dye.

[2] It can also be used for research in photocatalysis (as degradation object).

Kekulé, skeletal formula of acid red 88
Ball-and-stick model of the component ions of acid red 88