inorganic waters do not contain rust
ammonium_nitrate is inorganic_substance. water_hemlock is poisonous_plant. rust is plant_disease. rustproofing is mixture. water has no_color ag is inorganic_substance. ferrous_sulfate is inorganic_compound. international_waters is unnatural_thing. rubidium_hydroxide is inorganic_substance. nh4 is inorganic_substance.