Also 8 copp-, cupp-. [f. CUPEL v. + -ATION, after F. coupellation.] The process of assaying or refining the precious metals in a cupel; the separation of silver from argentiferous lead, on a large scale, on a cupel.
a. 1691. [see CUPELLING b].
1750. Phil. Trans., XLVI. 586. That Gold and Silver may be purified from all heterogeneous Substances by Coppellation.
1880. Sat. Rev., 20 March, 385. Mr. Crookes suggests that thallium might be used instead of lead for the cupellation of silver.
