Rutile flour is a refined form of the mineral rutile, composed primarily of titanium dioxide (TiO2), which is used in ceramics for a variety of aesthetic and functional effects. In particular, rutile flour is known for its ability to create speckled and textured effects in glazes. Its presence in glazes allows irregular patterns and visual effects to develop that mimic the appearance of natural stone, bringing depth and variation to the glazed surface.
One of the most useful properties of rutile flour is its function as an opacifier, especially important when it is desired to hide color or imperfections in the underlying clay body, as it provides a more uniform coverage. The titanium dioxide present in rutile flour also contributes to the formation of matte or satin finishes.
In many stoneware pieces, especially those that follow a rustic or natural style, the speckled effects and colored streaks that characterize the glaze surface are often the result of the addition of rutile flour. This glazing technique produces dots or lines of color that vary in intensity, creating a textured and visually interesting surface.
Interesting Fact
Rutile is a mineral that is also used in other industries, such as paint and cosmetics, for its opacifying properties.
Helpful Tip
If you are looking to add texture and a more dynamic visual appearance to your glazes, rutile flour is an excellent choice. However, it is important to control the amount you use, as too much rutile can cause the glaze to become too dull or rough.
