21. For a tile colorer and sealer, try Grout Colorant , sold in tile stores. 22. Tin oxide is valued in glazes as both an opacifier and as a white colorant . 23. Calcium chlorate is occasionally used in pyrotechnics, as an oxidizer and pink flame colorant . 24. It is used as a yellow colorant . 25. Uranium is used as a colorant in uranium glass, producing lemon yellow to green colors. 26. A colorant can act as either a pigment or a dye depending on the vehicle involved. 27. The main colorant of madder was discovered by Robiquet and Colin in 1827 and called alizarin. 28. Indigo carmine, or indigo, is an indigo derivative which is also used as a colorant . 29. The inks involved are usually water-based and use either pigments or dyes as the colorant . 30. The location of a leak can be visually identified more easily if the water contains a colorant .
