Alum blocks after shaving: useful habit or old-school placebo?
On the Badger & Blade wet-shaving forum, a shaver with sensitive skin said he had avoided alum blocks for years, worried the sting would be too much. He had relied on a styptic roll-on for nicks plus an aftershave balm, but kept getting irritation that lasted longer than it should. After finally buying a block at a shave shop, he was annoyed he hadn't done it sooner. The thread ran to three pages.
What the replies said
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Many long-time users said it's in their routine most days: it stings where you were too aggressive, which works as feedback on technique, and it helps with small nicks and 'weepers'.
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Not all blocks are the same: the main ingredient is potassium alum; some are cut from natural crystal and others formed, and a French brand, Osma, was repeatedly praised for not crumbling. Blocks in a holder are harder to drop and shatter.
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Several rinse it off after a minute or two; one had been told that leaving it on makes skin feel chalky and dulls the aftershave. Others agreed it can be drying and follow up with balm.
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Sceptics too: a wet shaver of many decades never felt the need; another only uses it to improve grip on a wet brush or razor; someone with combination skin found it too drying.
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A few also use the same crystal as a deodorant.
Desk note: By the thread's own account, alum tightens and dries rather than moisturises, so it pairs with a balm. It also can't fix technique: the American Academy of Dermatology's basics still do the heavy lifting: wet skin and hair first, use a shaving cream or gel, and shave in the direction of growth. If you get recurring bumps or ingrown hairs, have a dermatologist look rather than adding more post-shave products.
Alum block, styptic pencil or nothing: what's in your post-shave kit?
Original thread: Badger & Blade — "I finally tried an alum block and…" · Source: AAD — How to shave
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