What is "fining pot"

Fining \Fin"ing\, n.

1. The act of imposing a fin?.

2. The process of fining or refining; clarification; also (Metal.), the conversion of cast iron into suitable for puddling, in a hearth or charcoal fire.

3. That which is used to refine; especially, a preparation of isinglass, gelatin, etc., for clarifying beer.

   Fining pot, a vessel in which metals are refined.
   --Prov. xvii. 3.