hromium oxide green is green powder, hexagonal crystal system, density 5.21g/cm3, specific heat capacity (20 C)/0.17J/kg), refractive index 2.5, insoluble in water, acid and organic solvents, slightly soluble in concentrated sodium hydroxide solution, soluble in hot sodium bromate solution, hot concentrated perchloric acid solution or boiling sulfur-phosphorus mixed acid. It is a high-quality refractory material with a melting point of 2265 C and a boiling point of about 3000 C. Atmospheric and corrosive gases (H2S, SO2, etc.) are extremely stable and have excellent weather resistance. They have metallic luster, magnetism, strong covering power, high temperature resistance, light resistance, acid and alkali resistance. They are stable in the atmosphere and have excellent outstanding pigments quality and fastness.