Tin oxide has long been used to opacify glazes in oxidation at all temperatures.
Tin is also a player in the development of ceramic colors, for example chrome tin pinks and maroons. Tin with iron in oxidation makes a warmer shade of brown than zirconium does.
Tin can react with titanium and rutile to transform the color and character of a glaze. Although tin oxide is a little more expensive, very little is required to produce stunning effects in many colored glazes.