4-amino-2-hydroxytoluene

Harm score: 4 (Slightly harmful chemistry)

4-amino-2-hydroxytoluene is an organic compound that is known by many other names - you may come across labels such as neutral henna, colorless henna, Italian senna, Cassia obovata, Senna obovata, Senna obtusa, Cassia obtusa, or Cassia italica. This compound is particularly popular in the cosmetic industry, where it finds wide application.

Specifically, 4-amino-2-hydroxytoluene is most commonly used for the manufacture of hair dyes and other cosmetic hair care products. This substance has the ability to penetrate deep into the hair structure and leave a permanent colour. In addition, neutral henna, as this product is also sometimes called, is used for its nourishing and conditioning effects on the hair. Its ability to strengthen hair and add shine makes it a common ingredient in shampoos, conditioners, hair masks and other hair care products. Among other things, the compound is also an ingredient in some types of tattoo inks. However, it is important to point out that although this substance is relatively gentle on the skin and hair, it can cause an allergic reaction in sensitive individuals. Therefore, it is always important to perform a patch test before using a product with this applicator.