1780.—“At Quedah, there is a trade for calin (see CALAY) or tutenague…to
export to different parts of the Indies.”—Dunn, New Directory, 5th ed. 338.
1797.—“Tu-te-nag is, properly
speaking, zinc, extracted from a rich ore or calamine; the ore is powdered and mixed with charcoal dust,
and placed in earthen jars over a slow fire, by means of which the metal rises in form of vapour, in a
common distilling apparatus, and afterwards is condensed in water.”—Staunton’s Acct. of Lord Macartney’s
Embassy, 4to ed. ii. 540.