The well-known and extensively documented Norton White Tile (NWT) method is based on this property of TiO 2, as a main component of some common white paints sold in spray cans. These structural irregularities do not reflect the visible light, making such surface-modified titanium dioxide look black. This is mostly due to formation of crystalline defects on the surface of TiO 2 particles, as a result of partial reduction of titanium ions at high temperature, especially in presence of carbon and organic substances. Despite its white color, it is responsible for black color after lasering. The glazed surface should be clean and free of grease, use isopropanol to clean it before using.Īvailable in pottery stores. These are widely available in construction stores, sometimes referred to as porcelain tiles.
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