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.
A third class of pigments found in leaves is the anthocyanins. Anthocyanins absorb blue, blue-green and green light. When leaves contain high concentrations of anthocyanins relative to other pigments, the leaves appear red or purple to our eyes.Anthocyanin pigments are involved in the red skin of apples, and the purple color of grapes.nthocyanins absorb blue, blue-green and green light. When leaves contain high concentrations of anthocyanins relative to other pigments, the leaves appear red or purple to our eyes. Anthocyanin pigments are involved in the red skin of apples, and the purple color of grapes.