Back to Ingredient Dictionary

HC YELLOW NO. 18

Description

HC Yellow No. 18 is a synthetic hair dye ingredient primarily used in semi-permanent and temporary hair coloring products. This compound belongs to the azo dye family and is characterized by its ability to impart yellow to golden hues to hair. Its chemical structure allows it to penetrate the hair shaft, providing color without significantly altering the hair's natural protein structure.

In formulations, HC Yellow No. 18 is often combined with other dye molecules to create a range of warm tones, from light blonde to rich golden brown. Its molecular size and composition contribute to its stability and color fastness, allowing for prolonged color retention compared to some other temporary dyes.

Safety assessments have shown that HC Yellow No. 18 has a low risk of skin irritation when used as directed in hair dye products. However, as with all hair dyes, patch testing is recommended to check for individual sensitivities. The ingredient is regulated by cosmetic authorities in various countries, including the European Union, where its use is permitted under specific concentration limits in hair dye formulations.