Fining

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Fining

(p. pr. & vb. n.) of Fine
(n.) The act of imposing a fin/.
(n.) The process of fining or refining; clarification; also (Metal.), the conversion of cast iron into suitable for puddling, in a hearth or charcoal fire.
(n.) That which is used to refine; especially, a preparation of isinglass, gelatin, etc., for clarifying beer.