During the next 100 years, this recipe remained largely unchanged. But some producers wanted to make a richer, riper style of wine, which would mean eliminating the white grapes. Piero Antinori did that in 1970, but because the wine did not conform to the Chianti Classico recipe, he had to give the wine a different name. He chose Tignanello, the name of the vineyard. The following year, Antinori added cabernet sauvignon to the blend. Tignanello became a sensation, and the blend has remained to this day.
A new type of wine had been created, and soon after, the term "super Tuscan" was coined for any Tuscan red that fell outside the traditional blending laws, but came to describe the most expensive, most full-bodied wine a producer offered.
Tom Hyland, "Dramatic New Chianti Taste," Newsday, May 15, 2002
Although these 'Super Tuscans' have greatly boosted the prestige of Italian wine in general, they have not had much relevance to its best known regional variety, Chianti Classico, which is the largest of Italy's officially sanctioned DOCG categories (Denominazione di Origine Controllata e Garantita).
Bruce Palling, "Drink: In search of the perfect Chianti," The Independent, August 26 1989