After contamination with foreign substances may be re-refined, and by virtue of the high value of this commodity this is usually an economic proposition.
Oil contaminated by water can usually be separated to a great extent in storage tanks by allowing the water to settle to the bottom and then draining off. It is impossible to effect clarification of the entire quantity -some residue will always remain.
Where oils are shipped in drums immediate steps should be taken to decant contents of leaky drums into sound drums.
See also BULK OILS and FATS.
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