1. Coal-tar Dyes:
Coal-tar dyes include p-Phenylenediamine and colors listed as CI followed by five digits. They are used in hair dyes and may be contaminated with heavy metals toxic to the brain.
1. Coal-tar Dyes:
Coal-tar dyes include p-Phenylenediamine and colors listed as CI followed by five digits. They are used in hair dyes and may be contaminated with heavy metals toxic to the brain.