EFCO manufactures architectural windows, curtain walls, storefronts, and entry systems designed for commercial construction needs, sold through independent sales representatives across the United States.
Short History of Black Pigments. Carbon black was the first black. This dull black is the easiest to manufacture because it is made of charcoal. Another black is vine black, which is traditionally made by charring desiccated grape vines and stems, which produce beautiful bluish blacks. Bone black, made of burnt bones from prehistoric times, is the deepest available black.
â¢ Charcoal pencils, used primarily by artists, are another popular form of black lead pencil, made from a different form of carbon than graphite that is more like coal. These make a very dark black mark on the paper compared to even very soft graphite pencils, such as 8B.