Tin Oxide, SnO2 or Sn(iv) oxide, is a metal oxide that can be found in nature as the mineral cassiterite and has uses in the ceramics and glass industry as well as chemical uses as a reducing agent and precursor to other tin compounds and salts.
As a ceramic material, tin glazes can be comparable to zircon ones as both are used as opacifiers. However, where zircon oxide produces a harder glaze, reduces thermal expansion more, and is more affordable, you can use much smaller amounts of tin oxide to achieve the same opacifying effects and add interesting color variation to the glaze. That being said, tin oxide can be found in many ceramic and glass pigments and glazes, and is usually combined with other metal oxides to produce certain colors.
* Tin glazes do not usually opacify in a reduction firing.
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