” Some arsenic trioxide finds its way to the air. Condensation on the vapors on the surface at temperatures higher than 250° C varieties the glassy modification, which bit by bit alterations for the crystalline, monoclinic variety. In the processing of As2O3 the oxide is Generally reduced withcarbon: 2As2O3+3C?→As4+3CO2 The http://https//chemscenter.com