A variant term is so-called tab toning, applied exclusively to commemorative silver. Many 1930s commemoratives were sent to their original buyers in small cardboard holders. The coins were kept in place by a paper or cardboard band or tab. After decades in this style of holder a commemorative will achieve distinctive toning, deeper in the exposed areas but nearly fully brilliant where protected from the air by the tab and surrounding cardboard. Such original color is often referred to as tab toning. First heard by the author in 1992 from David V. at Superior Coin and Stamp, although probably predating this by many years.