scoring

v. t. [ imp. & p. p. Scorified p. pr. & vb. n. Scorifying ] [ Scoria + -fy: cf. F. scorifier. ] (Chem.) To reduce to scoria or slag; specifically, in assaying, to fuse so as to separate the gangue and earthy material, with borax, lead, soda, etc., thus leaving the gold and silver in a lead button; hence, to separate from, or by means of, a slag. [ 1913 Webster ]