The Alum Block (Phitkari): A 100-Year-Old After-Shave That Still Beats Most Modern Ones
Walk into any old-school barber and you'll often see a translucent block by the chair. That's phitkari — potassium alum (KAl(SO₄)₂·12H₂O) — and barbers have rubbed it on freshly shaved skin for over a century for one simple reason: it works.
Alum is an astringent and a mild antiseptic. It contracts skin tissue and helps tiny shaving nicks stop bleeding, while leaving none of the perfume or alcohol burn of a bottled after-shave.
How an alum block actually works
The aluminium ions in alum cause proteins on the skin surface to contract — that's the 'tightening' you feel. On a nick, that same astringency helps the small vessel close, which is why it stops minor bleeding. It also creates a briefly hostile surface for odour-causing bacteria, which is the basis of its use as a deodorant.
Using it after shaving
- Shave as usual and rinse with cool water — leave the skin damp.
- Wet the alum block and glide it gently over the shaved area. Don't scrub.
- Wait about a minute, then rinse off the slight residue and pat dry.
- Rinse the block and stand it on a dry surface so it lasts — a wet block left in a puddle dissolves fast.
You'll feel a light tightening, not a burn. If it stings badly, your skin is either very freshly abraded or sensitive — use less pressure and rinse sooner.
As a natural deodorant
Wet the block and swipe it over clean, dry underarms. Alum doesn't stop sweat like an antiperspirant; it limits the bacteria that turn sweat into smell. It is fragrance-free and leaves no white marks, which is why many people switch to it.
Other practical uses
- Aftershave for legs/underarms to calm razor irritation.
- A quick astringent on minor shaving cuts.
- Traditional water-clarifying agent (alum makes fine particles clump and settle).
Safety and care
Alum is for external use. Don't apply it to deep cuts or broken, raw skin. A small number of people find it drying with daily use — moisturise afterwards if needed. Keep the block dry between uses; stored well, a single block lasts many months.
Frequently Asked Questions
Is an alum block the same as a deodorant?
It works as a natural deodorant by reducing odour bacteria, but it is not an antiperspirant — it won't block sweat. Many people prefer that because it is fragrance- and aluminium-chlorohydrate-free.
Does the alum block sting?
On intact skin you feel a light tightening, not a sting. A sharp sting usually means the skin is freshly nicked or very sensitive — use lighter pressure and rinse sooner.
How long does one alum block last?
Used a few times a week and kept dry between uses, a block commonly lasts six months to a year. Leaving it wet is what wears it down fast.
Can women use phitkari after shaving or waxing?
Yes — it's commonly used to calm post-shave and post-wax irritation on legs and underarms. Patch test first if your skin is reactive.
Azlok Alum Bar is 100% pure natural phitkari — a chemical-free after-shave, deodorant and skin-tightening aid. Keep one by the sink and let it dry between uses.