TEST'ING, ppr. [from test.] Trying for proof; proving by a standard or by experiment.

A plan for testing alkalies--

TEST'ING, n. The act of trying for proof.

1. In metallurgy, the operation of refining large quantities of gold or silver by means of lead, in the vessel called a test. In this process, the extraneous matter is vitrified, scarified or destroyed, and the metal left pure. This operation is performed in the manner of cupellation.