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Follow the skin preparation guide in the Wiki, then follow the Wiki article on shaving (especially the bits on passes and skin stretching). Do not apply any pressure, but let the razor do the work....

Interesting. And not what alum is supposed to do (or does for me), cf Alum - Straight Razor Place Wiki.

If the alum stings, you have cuts. If it stings a lot, you have many or deep cuts. If that...