Resorcinol

Resorcinol is a chemical compound commonly used in hair dyes, particularly in permanent coloring systems, to create a desired shade and depth of color. It acts as a coupler, reacting with other dye intermediates (like p-phenylenediamines) and a developer (usually peroxide) to permanently bond the color to the hair. While it provides vibrant and long-lasting color, resorcinol has raised some safety concerns due to potential skin irritation, endocrine disruption, and environmental impact.