Filtrate n. That which has been filtered; the liquid which has passed through the filter in the process of filtration. Contrasted with retentate, the material remaining on the filter.
... existing as a natural sulphide. Taking 200 gr. of ore from a sample assaying 17 oz. fine gold per ton, grinding it finely and heating for some hours with yellow sodium sulphide—on decomposing the filtrate and treating for gold I got a result at the rate of 12 oz. per ton. This was repeated several times ... — Getting Gold • J. C. F. Johnson
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