Certain chemicals that absorb light at one wavelength and fluoresce at another wavelength above or below the absorption wavelength are called fluorescent dyes.

Genotoxic impurities can directly act on DNA in the human body, causing DNA damage and having carcinogenic, teratogenic, or mutagenic properties. A small amount of genotoxic impurities can also cause great damage to the human body. The study of genotoxic impurities has attracted the wide