From 1996, Chianti Wines which meet some "more" special rules may be labelled as Chianti Superiore DOCG.
To be able to label their wines as Chianti Superiore, wine producers must respect some specific rules likes the following one: grapes must be grown exclusively in Chianti and Chianti sub-zone name must be omit.
In addition the Chianti Superiore must contains at least 75% Sangiovese, no more than 10% from Black Canaiolo (Canaiolo Nero), no more than 10% from Trebbiano Toscano e Malvasia (strictly from Chianti) and no more than 20% from a number of other authorized red grapes like Colorino, Cabernet Savignon or Merlot.
The idea behind the label is to ensure to the consumers the high quality of the wine, without knowing the exact location of the vineyard. Since 1996, the allowed manufacturers to produce bottles of Chianti Superiore DOCG does not exceed the quota of 20.