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Clove oil
I would just add to the caution regarding the wrinkling of poppy oil. I loved painting with it but watched several paintings (from my college days) wrinkle and separate to the extent that they looked like salt flats. It provided an aged and rustic look to paintings that were done in an old master's style, but I decided that it was not worth the risk to continue its use.
I have used oil of cloves and followed the advice that Tom recommended without problems. And you will enjoy the aroma as well.
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