Topic: Flint Glass. What is it?

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Flint is 1/ a technical term for early lead glass and 2/ used as a term for clear glass by some glassmakers.

A very fair description. But while no 2 is correct, it is not really in common usage among artists and collectors these days. With the exception of Whitefriars collectors I have only heard one or two people use the term in the last 20 years. However its use is still widespread in industry: http://www.britglass.org.uk/search.asp?searchTerm=flint&imageField.x=0&imageField.y=0

You would be unlikely to hear the term in the glass department at Harrods, these days.