Tin oxide is one of the most common and effective opacifiers in ceramics, mainly used to make glazes white and opaque. This compound is essential in the production of earthenware, where it acts as a neutral and luminous base, on which vibrant and detailed colored decorations can be applied without tonal interference. Tin oxide is particularly valued in majolica ceramics and cuerda seca techniques, where it helps to enhance the intensity of decorations by providing a bright white background.
In addition to its use in white glazes, tin oxide is also used in small proportions in colored glazes to shade and soften tones, creating a visual effect of depth and opacity. Although it is generally a high-cost material, its ability to resist color degradation at high temperatures and its stability in the kiln make it a valuable resource in both utilitarian and decorative ceramics.
Interesting Fact
The use of tin oxide in ceramics dates back to the Middle Ages, when European potters used it to imitate Chinese porcelain.
Helpful Tip
When using tin oxide to opacify glazes, remember that it can increase the viscosity of the liquid glaze. Adjust the density of the glaze to make it easier to apply and prevent it from becoming too thick.
