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.
Clay earth pigments (naturally formed iron oxides). 1  Raw Umber (PBr7): a natural clay pigment consisting of iron oxide, manganese oxide and aluminum oxide: Fe 2 O 3 + MnO 2 + nH 2 O + Si + AlO 3. 2  Raw Sienna (PBr7): a naturally occurring yellow-brown pigment from limonite clay.he following list includes commercially or artistically important inorganic pigments of natural and synthetic origin. The only dyes listed are derived directly from inorganic pigments.