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.
Composition. Black powder is made of potassium nitrate, charcoal and sulfur. These ingredients are mechanically combined in an approximate ratio around 75:14:11 to 75:15:10 respectively. The recipe is a bit forgiving as to the exact quantities of each ingredient.