tin-glass

I have been also informed that it consisteth of a composition which hath thirty pounds of kettle brass to a thousand pounds of tin, whereunto they add three or four pounds of tin-glass; but as too much of this doth make the stuff brickle, so the more the brass be, the better is the pewter, and more profitable unto him that doth buy and purchase the same.

Chronicle and Romance (The Harvard Classics Series) Thomas Malory Jean Froissart

I have been also informed that it consisteth of a composition which hath thirty pounds of kettle brass to a thousand pounds of tin, whereunto they add three or four pounds of tin-glass; but as too much of this doth make the stuff brickle, so the more the brass be, the better is the pewter, and more profitable unto him that doth buy and purchase the same.

Of Sundry Minerals and Metals. Chapter XI. [1577, Book III., Chapters 16 and 18; 1587, Book III., Chapters 10 and 11 1909