2,4-diaminophenoxyethanol sulphate

Harm score: 4 (Slightly harmful chemistry)

2,4-Diaminophenoxyethanol sulfate is a chemical ingredient that is often included in some cosmetic products, especially those intended for hair care. It is also known as Phenylenediamine Sulfate or also longer as Sulfuric acid, 2,4-diaminophenoxyethanol, salt. At the World Health Organization, its molar mass is listed as 266.3 g/mol. It is used extensively due to its unique properties, such as its ability to react with acids and alcohols or to resist oxidation.

The main industry where 2,4-diaminophenoxyethanol sulfate is used is the cosmetics industry. In particular, it is used in the manufacture of hair dyes, as this chemical compound is able to penetrate the hair fibre and thus guarantee a long-lasting and intense colour. It also has universal use, as it can be a component of both permanent, semi-permanent and direct-acting hair dyes. However, its use is controversial. Although it causes no inconvenience in many people, it can cause allergic reactions in more sensitive individuals. Therefore, it is important to perform an allergy test before using products containing this ingredient.