Carbon rods for arc lighting can be made from carbon black*. Below are some carbon black links.
Offered by Michael.
*Carbon black is produced from "sour" gas - natural gas that contains more than 1 grain of hydrogen sulfide or more than two grains of sulfur per hundred standard cubic feet.
To make carbon black, natural gas or other carbon compounds are burned in a limited amount of air to give a thick, black smoke that contains extremely small particles of carbon, which can be collected when the gas is cooled and passed through an electrostatic precipitator.
Amorphous carbon is formed when a material containing carbon is burned without enough oxygen for it to burn completely. This black soot, also known as lampblack, gas black, channel black or carbon black, is used to make inks, paints and rubber products. It can also be pressed into shapes and is used to form the cores of most dry cell batteries, among other things.