This grout is good because it dries fairly quickly, is waterproof and has minimal shrinkage, leaving a lovely smooth finish. Grout is made predominantly of cement, sand and oxides. The white grout can be tinted to any colour using either oxides or waterbased paint pigments. When experimenting with colouring grout, mix a small amount and allow it to dry to determine the the right proportions to create exactly the effect you want.