I bought menthol crystals from the net. Crushed them and added a pinch or two to a 16oz bottle of Dickinson's witch hazel (has 14% alcohol). Wow, I may have found my favorite aftershave! The cooling effect lasts 15 minutes and lingers for about an hour (but I guess it depends on how much you add to your concoction). A bonus I wasn't anticipating is the menthol smells like mint which helps to kill the "hot dog water" smell of the witch hazel.
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