Discussion
Oil repellency, unlike water repellency, essentially requires
Answer: C
Correct answer: a fluorochemical finish
Oil has a much lower surface tension than water, so a finish must have a lower surface energy still to repel it, and only fluorocarbon chemistry - with its densely packed CF3 groups - goes low enough. Waxes and silicones repel water perfectly well and are wetted by oil, which is exactly the distinction the next item turns on.
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