Vura fitkari spray lying among large raw alum crystals

What is fitkari (phitkari)? Potassium alum, explained

By the Vura team

Short answer: fitkari, also spelt phitkari, is potassium alum, a natural mineral salt. On skin it works as a mild astringent and makes the surface a harder place for odour-causing bacteria to grow. That is why it has been used as an underarm deodorant in Indian homes for generations. It does not stop you sweating.

Looking for something specific?

Most of us met Fitkari long before we knew what it was. A cloudy white block on a shelf near the sink. Someone in the family reached for it after a shave, or held it against a small cut. Nobody explained it. It was just there, and it worked.

We built our underarm spray around that block. Here is what it actually is, and why we thought it deserved a better format than a lump of rock by the basin.

What Fitkari is

Fitkari is potassium alum. In a lab it goes by potassium aluminium sulphate, and on an ingredient list you will see it written as Potassium Alum. It is a naturally occurring mineral salt, and it has been used across Bharat for generations for skin, for water, and for small cuts.

It has two properties that matter for underarms.

The first is that it is an astringent. It has a mild tightening effect on the skin's surface, which is why it has always been a post-shave staple.

The second is the one that does the real work: it makes your skin an unwelcoming place for the bacteria that cause odour.

Why that matters more than it sounds

Your sweat does not smell. This surprises people, so it is worth sitting with for a second.

Fresh sweat is close to odourless. What you smell at the end of a long day is the by-product of bacteria that live on your skin breaking that sweat down. The smell is theirs, not yours. We have written about that in more detail in why underarms smell.

Once you know that, you can see there are two ways to deal with the problem.

You can stop the sweat. That is what an antiperspirant does — it plugs the sweat duct so less sweat reaches the surface. No sweat, less for the bacteria to work on.

Or you can deal with the bacteria and leave the sweat alone.

Fitkari takes the second route. It sits on the surface of your skin and makes it harder for odour-causing bacteria to multiply there. Your sweat glands carry on doing their job. Sweating is how your body cools itself, and we did not want to interfere with that.

So why not just use the block?

Fair question. The block works. It is also cheap and it lasts for months.

But we kept running into the same problems with it, and so did everyone we asked.

It has to be wet

An alum block only works if you wet it first, then rub it on damp skin. That is a fussy thing to do on a weekday morning when you are already late.

You have to rub it on

Dragging a hard mineral block across freshly shaved skin is not comfortable. For anyone with sensitive underarms, it is a reliable way to end up sore.

Everyone shares it

One block, one bathroom, several people, all rubbing it directly onto their skin. We do not need to spell this one out.

It cracks

Drop it once and you are left with shards. Leave it sitting in water and it slowly turns to sludge.

What we did instead

We wanted the Fitkari to stay and the inconvenience to go. So we put it into a spray.

You spray it on. Nothing touches your skin, so nothing gets shared and nothing gets dragged across a fresh shave. It dries on its own in a few seconds and leaves no residue, which means no white marks down the sides of your shirts.

We built the rest of the formula to be kind to the skin it sits on, because underarm skin is thin and it takes a lot of abuse. Damask rose water tones and refreshes. Aloe vera soothes. Glycerin holds moisture in, so your skin stays soft rather than tight. A trace of real rose oil is the only scent we use — there is no synthetic fragrance in the bottle.

Here is the full list, because we would rather you saw all of it than a curated highlight reel:

Aqua, Rosa Damascena Flower Water, Potassium Alum, Glycerin, Propanediol, Triethyl Citrate, Aloe Barbadensis Leaf Extract, Rosa Damascena Flower Oil, Polysorbate 20, Sodium Benzoate, Potassium Sorbate, Citric Acid.

Twelve ingredients. No aluminium chlorohydrate, no parabens, no drying alcohol, no synthetic fragrance.

The question we get most

"You say aluminium free, but alum has aluminium in the name."

It does, and it is a completely reasonable thing to ask. Potassium alum and aluminium chlorohydrate are different compounds that behave in different ways, and the confusion between them is the single most common thing we clear up. We gave it a post of its own: potassium alum is not aluminium chlorohydrate.

How to use it

Spray it onto clean, dry underarms. Two or three sprays a side is plenty. Let it dry on its own — do not rub it in, and do not put a shirt on while it is still wet.

Use it daily. A 50 ml bottle usually lasts about a month at that rate.

One honest note: if you are coming off a conventional antiperspirant, give yourself a couple of weeks. Your body has been having its sweat glands blocked, and it takes a little while to settle once you stop. That is normal and it passes. We have written about what those first two weeks actually feel like here.

Why we bothered

We started Vura because we did not think personal care should depend on chemical shortcuts. When we looked back at the remedies we grew up around, we kept coming back to this one — the block on the shelf that nobody explained and everybody used.

It was already good. It just needed to fit into a normal morning.

We blend our batches slowly, and we will always tell you what is in them. If you want to know anything about what is in your bottle, write to us at support@vuraskincare.in.

Quick answers

What is fitkari called in English?
Alum. More exactly, potassium alum or potash alum. On an ingredient list it is written as Potassium Alum.

Is fitkari the same as phitkari?
Yes. They are two English spellings of the same Hindi word, फिटकरी. You will also see phatkari and fitkiri.

Does fitkari stop sweating?
No. It works on the bacteria that cause smell, not on your sweat glands.

Can I use fitkari on my underarms every day?
For most people, yes. Here is what to watch for with daily use.

Does fitkari contain aluminium?
Yes, as part of the compound. It is not the sweat-blocking aluminium salt used in antiperspirants. Here is the difference.

Try the Vura Mineral Underarm Spray →

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