The document discusses various classes of antiseptics and disinfectants, including phenol derivatives, oxidizing agents, halogens, biguanides, quaternary ammonium compounds, alcohols, aldehydes, and dyes. It describes the mechanisms of action of common antiseptic and disinfectant ingredients such as phenol, chlorohexanol, potassium permanganate, hydrogen peroxide, iodine, chlorhexidine, cetrimide, ethanol, formaldehyde, and gentian violet. The classifications and properties of these antiseptic and disinfectant agents are presented.