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Disclaimer - I am not a chemist, I have researched this stuff on the internet and decided it's safe for me. If anyone else wants to try this, on their own head be it.

I bought a pack of 100g Menthol crystals here:

https://www.amazon.co.uk/gp/product/B00CZ58LBI/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

I bought a bottle of 250 ml Di-Propylene Glycol here:

https://www.amazon.co.uk/gp/product/B004SM9H5A/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

I have been dissolving the menthol crystals in the glycol gradually over the last few days. I just tip them in to the bottle, and then leave the bottle in a sink of warm water, and the menthol dissolves. I kept adding more, and testing the mixture gradually over the course of several days. I would estimate I have now used about half the menthol crystals and the solution is just right for me. I've had to tip away a bit of the solution to make room in the bottle.

The end result is that I have a solution from which I can drop a couple of droplets onto my shaving brush and mix with my soap, and I get a really massive blast of menthol in my shaving soap.

I'm happy! Do your own research and decide if you think the above is safe :)
 
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