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Calcitec® is used for facade clay brick production, as clay has compounds of silica, alumina, feldspar and iron oxides. So it will burn to a brown, pink or red brick, depending on the amount of iron oxide in the clay. The presence of Calcitec® in the mix will change a brick’s color to a yellow or cream color. This can be corrected by using coloring agents to achieve a broad color portfolio of trendy bricks.