FerroTint F4600 Red Iron Oxide is one of our most economical red pigments. This pigment does not go through the extensive processing of our “Best or Better Series” pigments, but it still provides the quality needed for many applications. Designed for use in cement-based building products, F4600 is processed to eliminate costly production steps. Like all Red Iron Oxides, F4600, has excellent lightfastness, heat and chemical resistance. In normal applications it is considered a permanent pigment. The iconic Red American Barn is a testament to the durability of Red Iron Oxides.