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.
Transparent  yellow and transparent magenta mix into the secondary pigment color  red. The 3rd transparent primary pigment color is cyan, made from  the copper element, PB15. Transparent yellow and transparent cyan  make the secondary color green.ransparent cyan mixed with the the  transparent magenta color make the secondary color ultramarine  blue. Yellow, magenta and cyan are the primary pigment colors, red,  green and blue are the secondary pigment colors. Light uses the  opposite colors, the secondary pigment colors become the primary  light colors.