Vegetable oils under UV light.
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Previously:
https://www.homemadetools.net/forum/...691#post201701
https://www.homemadetools.net/forum/...451#post192920
https://www.homemadetools.net/forum/...819#post210053
https://www.homemadetools.net/forum/...136#post211020
https://www.homemadetools.net/forum/...699#post111306
