untinning

Verb

untin (third-person singular simple present untins, present participle untinning, simple past and past participle untinned)

1. (transitive) To remove the tin (metal) from.
   • As regards the treatment of slimes, I think nothing so effective as the frame for untinning the stuff which is reduced to a pulp; hence the difficulty in dealing with it, and the great loss sustained by miners, whose lost tin is reproduced by the tin streamers or squatters who line the sides of the...1884, Capt. W. Trague, “Treatment of Tin Ores from the Shaft's Mouth to the Smelting-House”, in Proceedings of the Mining Institute of Cornwall, volume 1, page 159