#chemical_agent  an agent that produces chemical reactions
  supertype:  #agent.causal_agent  a substance that exerts some force or effect
  subtype:  #active_agent__active  chemical agent capable of activity
  subtype:  #reagent  a chemical agent for use in chemical reactions
  subtype:  #desiccant__drying_agent__drier__sicative  a substance that promotes drying (e.g., calcium oxide absorbs water and is used to remove moisture)
  subtype:  #oxidant__oxidizing_agent__oxidizingagent  a substance that oxidizes another substance
  subtype:  #reducing_agent__reducer__reductant  a substance capable of bringing about the reduction of another substance as it itself is oxidized; used in photography to lessen the density of a negative or print by oxidizing some of the slackened silver
     subtype:  #hydrazine  a colorless fuming corrosive liquid; a powerful reducing agent; used chiefly in rocket fuels
  subtype:  #scavenger  a chemical agent that is added to a chemical mixture to counteract the effects of impurities
  subtype:  #wetting_agent__wettingagent__wetter__surfactant__surface-active_agent  a substance capable of reducing the surface tension of a liquid in which it is dissolved
     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
  subtype:  #vesicant__vesicatory  a chemical agent that causes blistering

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