#wetting_agent__wettingagent__wetter__surfactant__surface-active_agent  a substance capable of reducing the surface tension of a liquid in which it is dissolved
  supertype:  chemical_agent  an agent that produces chemical reactions
  subtype:  emulsifier  a surface-active agent that promotes the formation of an emulsion
     subtype:  lecithin  a yellow phospholipid essential for the metabolism of fats; found in egg yolk and in many plant and animal cells; used commercially as an emulsifier
  subtype:  detergent  a surface-active chemical widely used in industry and laundering
     subtype:  anionic_detergent__anionicdetergent__anionic__nonionicdetergent  a class of synthetic detergents in which the molecules do not ionize in aqueous solutions
     subtype:  cationic_detergent__invert_soap  a class of synthetic detergents in which the surface-active part of the molecule is the cation
        subtype:  cetrimide  a cationic detergent that is a powerful disinfectant
     subtype:  sodium_lauryl_sulphate__sodium_lauryl_sulfate__sodiumlaurylsulfate__sl  a caustic detergent useful for removing grease; although commonly included in personal care items (shampoos and toothpastes etc.) it can irritate skin and should not be swallowed

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