What is the difference between flint and super-flint (also called extra-flint) glass?
Flint and super-flint are expressions for bottle glass qualities. Flint has good transparency, while super-flint offers the very best in clarity, often compared to crystal. Super-flint bottles tend to be of more substance, heavier, and often contain a deep base (or slug) – 20-30mm – that gives the bottle a further feel of quality. Super-flint tends to be the choice of brands in the premium spirits sector, particularly those in the Vodka, Cognac, Brandy and Whisky categories.
