Obs. rare–0. [ad. It. tasconio ‘a kind of white clay or marble, whereof goldsmiths pots … were made’ (Florio, 1598), ad. L. tasconium (Pliny).] (See quots.)
1726. Bailey, Tasco, a sort of Clay, for making Melting-Pots. Ibid. (1730), (folio), Tascony, a sort of white Earth like Chalk, and is the only Earth that endures the Blast of the Bellows and Heat of the Fire and running Metal.
1823. Crabb, Techn. Dict., Tasco.
