refining

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refining

The processing of a food (e.g., sugar cane) to extract a component of interest (sugar).

Health and natural food advocates are critical of this process, and believe beet sugar, molasses and honey to be far superior to refined or “white” sugar­—although the nutritive value of these unprocessed products in terms of minerals and vitamins is minimal.
References in classic literature ?
They had had ample time to provision the ship and the refining of the crude oil they had discovered north of the fort could have insured them an ample supply to carry them back to Germany.
Except when the refining process of Art judiciously removes from them all resemblance to Nature, I distinctly object to tears.