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.
- produced in stratum basal by melanocytes. - color may range form yellow-brown to black. - people of all skin colors have similar numbers of melanocytes in their skin (produce granules at the same rate) - diff colors and keratinocytes may contain more/less melanin. - derived from tyrosine through the action of tyrosinase. - lack of melanin: albinism.