... 120, 125 ,140,160 ,190and so on Synthetic red iron oxide from Tongchem are high quality inorganic pigments suitable for a wide ... , pavement, ready mixed concrete, masonry block, bricks.Colors range from the yellow shade red TC-100 to the blue shade ... red TC-186, all the products provide maximum tinting strength, water wettability, colour consistent, UV stable, alkali resistant and excellent chemical ...