Names: Copper, Copper (dusts and mists, as Cu), Cu
Appearance: Solid in various forms. turns green on exposure to moist air ; Reddish, lustrous, malleable, odorless solid.
SO2 – Sulfur dioxide
Other names: Sulfurous anhydride, Sulphur dioxide, Sulfurous acid anhydride
Appearance: Colorless gas ; Colourless gas or compressed liquefied gas with pungent odour ; Colorless gas with a characteristic, irritating, pungent odor. [Note: A liquid below 14°F. Shipped as a liquefied compressed gas.]