The overall gas composition found at Taftan includes CO2, H2S, SO2 and water. Sulfur is present in high quantities in fumarolic gases, which also contain arsenic. These gases are hence extremely acidic. The fumaroles have altered rocks, forming highly colourful exposures especially on Taftan's eastern flank. Ammonium chloride (salmiak) and sulfur has been collected around fumaroles. The thick sulfur layers on the southeastern summit were formerly extracted for use in Iran and Pakistan. Sulfur and sulfate deposits are also found lower on the volcano, from hot springs around Gooshe, at Sangān and Torshāb.