fining

 The act of imposing a fin1913 Webster]

 The process of fining or refining; clarification; also (Metal.), the conversion of cast iron into suitable for puddling, in a hearth or charcoal fire.  [1913 Webster]

 That which is used to refine; especially, a preparation of isinglass, gelatin, etc., for clarifying beer.  [1913 Webster]