Answer: REFINES

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Fine-tunes we know 4 Answers
Polishes we know 8 Answers
Purifies we know 4 Answers
Purifies, as petroleum we know 1 Answer
Rids of impurities we know 1 Answer
Processes, as oil we know 1 Answer
Finetunes we know 1 Answer
Acquires elegance we know 1 Answer

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