a gray or black crystalline compound produced from lime and coke. When mixed with water, it yields acetylene gas (C₂H₂), which has been used as an anesthetic and was once used as a source of illumination in miners' lamps.

Strong reducing agent. Ignites spontaneously in air at 150-180 oF.

After contact with skin, wash immediately with plenty of water. Gently and thoroughly wash the contaminated skin with running water and non-abrasive soap.

Animal studies suggest that this material may have fibrogenic effects and may cause heart, liver and kidney dystrophy in animals. Typical TWA 5 mg/m3.