---
product_id: 47936356
title: "Osma Bloc - Alum Block 75g (Soothes Shaving Irritation)"
brand: "osma laboratoires"
price: "₨6284"
currency: LKR
in_stock: true
reviews_count: 8
category: "Osma"
url: https://www.desertcart.lk/products/47936356-osma-bloc-alum-block-75g-soothes-shaving-irritation
store_origin: LK
region: Sri Lanka
---

# 75g pure potassium alum block Stops bleeding & soothes irritation Authentic French craftsmanship Osma Bloc - Alum Block 75g (Soothes Shaving Irritation)

**Brand:** osma laboratoires
**Price:** ₨6284
**Availability:** ✅ In Stock

## Summary

> 🪒 Elevate your shave game with the timeless power of Osma Bloc!

## Quick Answers

- **What is this?** Osma Bloc - Alum Block 75g (Soothes Shaving Irritation) by osma laboratoires
- **How much does it cost?** ₨6284 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/47936356-osma-bloc-alum-block-75g-soothes-shaving-irritation)

## Best For

- osma laboratoires enthusiasts

## Why This Product

- Trusted osma laboratoires brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Natural & Pure:** 100% potassium alum, free from parabens, fragrances, and dyes for sensitive skin
- • **Chill & Heal Instantly:** Cold alum stone calms razor burn and seals nicks post-shave
- • **Heritage Meets Modern Care:** Crafted in France since 1957, trusted by generations of discerning men
- • **Long-Lasting Ritual Upgrade:** Compact 75g block designed to last over a year with proper care
- • **Multi-Use Grooming Essential:** Doubles as an odorless deodorant and acne-fighting astringent

## Overview

Osma Bloc is a 75g pure potassium alum stone from France, expertly crafted to soothe shaving irritation, stop bleeding, and act as a natural astringent. Free from parabens, fragrances, and dyes, it’s perfect for sensitive skin and doubles as an odorless deodorant. A long-lasting grooming essential, Osma Bloc blends traditional French expertise with modern skincare needs, making it a must-have for the refined man’s shaving ritual.

## Description

Product Description Osma Bloc D'Alum Potassium Alum Stone (Rock Alum) 75 Gr Small Brick Shape By 5,8Cm X 3,7 Cm. Potassium Alum (Or Rock), Thanks To Its Antibacterial, Astringent And Haemostatic Properties, This Stone Is Perfect To Disinfect And Cauterize The Face Skin Immediately After The Shaving. Osma Bloc D'Alun 75 Gr- It's Also Very Available As Deodorant For Totally Odorless Armpits. (Used It, For Example, Moistened Immediately After Having A Shower). 100% Potassium Alum. Tips Of Use: 1. After The Shaving, Wet The Face With Cold Water; 2. Wet Osma Bloc D'Alum; 3. Gently Press On All Points In Which It's Made The Shaving Or Where There Are More Irritations; 4. Leave Act And Then Rinse The Face. Osma Laboratoires- Since 1957 Osma Laboratoires Is One Of The Main Actor For French Male Cosmetics. The Recent Male Interest's Explosion For Cosmetics, Is Not Just A Trend, But A Return To The Past When The Man Loved To Take Care Of Himself, Loved To Go To The Barber, Loved The Shaving, The Fragrances And The Perfumes, Loved To Be A Real Gentleman. Today, We'Re Going Back To Being What We Were. The Teachings Transmitted From Father To Son Are That Connection That Have Allowed To Osma Laboratoires To Be Loved, Today By 2 Families Generations And Thanks To The Enhancement Of Their Knowledge In The Sector Of The Shaving And The Constant Improvement, Osma Laboratories Will Be More And More Loved And Known By People Who Decide To Put Their Trust In This Company. Osma Laboratories Is The Last Alum Stones Manufacturer Remained In France, But It's Also The Only One To Create And Renew Male Shaving Products, Thanks To An Ancestral Knowledge Of The Raw Material Processing And The Research Of Natural Ingredients For The Composition Of Its Products. Old Style Shaving...For Today's Man. Indications Soothe the irritations due to shaving. Ingredients Natural Alum Directions Slightly wet the alum block after shaving.Remove excess water and gently pass it over the skin to soothe irritation stop bleeding.Avoid rubbing vigorously rinse before storage. Box Contains Osma Bloc - Alum Block (Soothes Shaving Irritation)

Review: The Perfect Finishing Touch - Now A Requirement! - This is great product. Like many here I had never used one of these until I purchased this from here recently. Actually I'd never heard of it before - and my friends haven't either! I happened to come across it while researching traditional wet shaving. Now I wouldn't be without it. My problem is sensitive skin and often have skin burn following shaving, my skin seems to hold heat for a while following shaving. But I also have a fairly quick bristle growth rate so have to shave regularly. I've tried various pre/during/post shaving products and methods to try and help and this has been one of the successes. The block arrived quickly in the nice box as pictured, the block is tough and cold, like a stone/mineral block, small in size but should last for ages. Following shaving I use it by wetting and wiping over my face and neck, 3 or 4 coatings. keep the block wet as it does dry quickly and is tough to use when it is drying. Leaves a very pleasant cool feeling, skin feels taut and smooth, seems to seal any nicks/cuts and leaves a nice sheen. Some prefer to wash their face once applied but I left it on because it feels really nice and protective on your skin. Seems to stop your skin becoming too oily as well; you feel clean and fresh. Very pleasant product. It's now a requirement in my shaving process, I can't recommend it highly enough. Natural products always win.
Review: Best value alum block - An excellent value alum block. Certain well known shops sell their own branded blocks for astronomical prices but what you get is exactly the same. I have in the past paid three times as much for a block from a certain Mayfair based shaving emporium but alum is alum and I can categorically state from a users experience that there is no difference whatsoever. There is no need to pay more. If you have not used alum before as part of your shaving ritual it is something you should definitely consider. Alum is a natural styptic and anti-septic and will seal and sterilise any small nicks in the skin. It will also help you to improve your technique and tell you when your razor is getting blunt. You can expect a little bit of stinging after applying the alum no matter what but if you are scraping the skin and causing lots of abrasion or your blade is blunt then you will really feel it. My technique is to finish shaving, wash face in warm water to remove soap, submerge face in cold water them make alum block wet with cold water and pass thoroughly over all shaved areas. Follow that with a skin tonic and a moisturiser and your face will feel smoother than it ever has. An extra benefit of using alum I find is that I hardly ever get collar burn if I shave in the morning and then wear a tie. It really settles the skin down again quickly after shaving. Tip: alum is a salt so it melts (slowly) in water. Make sure you dry it off thoroughly after use and store it somwhere dry. If you do then this small block will last a very long time - probably more than a year. Tip: Alum is an anti-septic and can be very helpful for acne even if you don't shave. I bought my teenage son one and he uses it to keep his spots under control. Tip: You can even use it as a deodorant because it closes pores and kills bacteria - you might want to get two blocks though if you are using one on your pits!

## Features

- Soothes shaving irritation
- 75g Block of Potassium Alum
- Can be used to soothe irritation post shave or as an astringent to stop bleeding
- Made in France

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B004NEHR28 |
| Age Range Description | Adult |
| Age range (description) | Adult |
| Best Sellers Rank | 18,770 in Health & Personal Care ( See Top 100 in Health & Personal Care ) 3 in Shaving Alum |
| Brand | Osma Laboratoires |
| Brand Name | Osma Laboratoires |
| Country Of Origin | France |
| Customer Reviews | 4.4 out of 5 stars 4,825 Reviews |
| Item Form | Block |
| Item form | Block |
| Manufacturer | Osma Laboratoires |
| Material Type Free | Paraben Free, Fragrance Free, Dye Free |
| Number of Items | 75 |
| Scent | Unscented |
| Scent Name | Unscented |
| Skin Type | All |
| Skin type | All |
| UPC | 798256388668 750557017425 793379161440 749447616466 |
| Unit Count | 75.0 Grams |

## Product Details

- **Age range (description):** Adult
- **Brand:** Osma Laboratoires
- **Item form:** Block
- **Material Type Free:** Paraben Free, Fragrance Free, Dye Free
- **Number of items:** 75
- **Product benefits:** Antibacterial
- **Scent:** Unscented
- **Skin type:** All
- **UPC:** 798256388668 750557017425 793379161440 749447616466
- **Unit count:** 75.0 gram

## Images

![Osma Bloc - Alum Block 75g (Soothes Shaving Irritation) - Image 1](https://m.media-amazon.com/images/I/51e10A7JGHL.jpg)

## Questions & Answers

**Q: Does the product really stop the bleeding while shaving or after I've finished ?**
A: Hi there, what I tend to do is to shave as per normal then rinse with COLD water. Then as soon as I have rinsed I leave my face wet then simply run the block over my face. It will give you a wake up! Then simply pat dry. In all honesty it wont cure open surgery but definitly help with the nicks etc. To sum this up I would not be without mine. They really are good and OSMA are good. Simply put the block back in its box. No need to dry it, the cardboard soaks it all up until the next use. Hope this helps, Laurie

**Q: Hello, is this packaged in paper or plastic?**
A: Hi the packaging is cardboard. I remove pre shave from the packet so doesnt get wet then dry and place back post shave. Last for ever but dont drop as will shatter. Hope this helps.

**Q: Is this natural alum or synthetic?**
A: Natural. A synthetic salt block could be tricky to make and would probably cost more than £4.50 :-)

**Q: How is the product packaged for delivery? There are lots of reviews mentioning stones arriving broken**
A: I guess it depends on the retailer that ships it. Amazon themselves choose to place in a folded piece of cardboard and consider it to be adequate. We however use a high grade of cardboard carton with either paper or eco sheet packaging peanuts to ensure no damages.

## Customer Reviews

### ⭐⭐⭐⭐⭐ The Perfect Finishing Touch - Now A Requirement!
*by J***S on 30 July 2012*

This is great product. Like many here I had never used one of these until I purchased this from here recently. Actually I'd never heard of it before - and my friends haven't either! I happened to come across it while researching traditional wet shaving. Now I wouldn't be without it. My problem is sensitive skin and often have skin burn following shaving, my skin seems to hold heat for a while following shaving. But I also have a fairly quick bristle growth rate so have to shave regularly. I've tried various pre/during/post shaving products and methods to try and help and this has been one of the successes. The block arrived quickly in the nice box as pictured, the block is tough and cold, like a stone/mineral block, small in size but should last for ages. Following shaving I use it by wetting and wiping over my face and neck, 3 or 4 coatings. keep the block wet as it does dry quickly and is tough to use when it is drying. Leaves a very pleasant cool feeling, skin feels taut and smooth, seems to seal any nicks/cuts and leaves a nice sheen. Some prefer to wash their face once applied but I left it on because it feels really nice and protective on your skin. Seems to stop your skin becoming too oily as well; you feel clean and fresh. Very pleasant product. It's now a requirement in my shaving process, I can't recommend it highly enough. Natural products always win.

### ⭐⭐⭐⭐⭐ Best value alum block
*by C***H on 8 March 2016*

An excellent value alum block. Certain well known shops sell their own branded blocks for astronomical prices but what you get is exactly the same. I have in the past paid three times as much for a block from a certain Mayfair based shaving emporium but alum is alum and I can categorically state from a users experience that there is no difference whatsoever. There is no need to pay more. If you have not used alum before as part of your shaving ritual it is something you should definitely consider. Alum is a natural styptic and anti-septic and will seal and sterilise any small nicks in the skin. It will also help you to improve your technique and tell you when your razor is getting blunt. You can expect a little bit of stinging after applying the alum no matter what but if you are scraping the skin and causing lots of abrasion or your blade is blunt then you will really feel it. My technique is to finish shaving, wash face in warm water to remove soap, submerge face in cold water them make alum block wet with cold water and pass thoroughly over all shaved areas. Follow that with a skin tonic and a moisturiser and your face will feel smoother than it ever has. An extra benefit of using alum I find is that I hardly ever get collar burn if I shave in the morning and then wear a tie. It really settles the skin down again quickly after shaving. Tip: alum is a salt so it melts (slowly) in water. Make sure you dry it off thoroughly after use and store it somwhere dry. If you do then this small block will last a very long time - probably more than a year. Tip: Alum is an anti-septic and can be very helpful for acne even if you don't shave. I bought my teenage son one and he uses it to keep his spots under control. Tip: You can even use it as a deodorant because it closes pores and kills bacteria - you might want to get two blocks though if you are using one on your pits!

### ⭐⭐⭐⭐ Great name brand alum
*by A***M on 6 October 2012*

Alum blocks (Or hydrated potassium aluminium sulphate for the geeky) is a mineral block made of large crystals. The idea is you moisten your face and rub the wet block gently on your face the alum and cold water act to close pores, tighten skin, remove moisture and seal cuts and prevent/soothe razor burn. It's also used as an underarm deodorant, never tried that personally. It's an astringent (skin dryer/ pore closer), with some antiseptic properties (will reduce spot development post shave). Very very little of the alum actually dissolves and this block will last many hundreds of shaves (maybe a decade if you don't drop/lose it first). However it is small at about 12cc (thick large rubber/eraser). This brand Osma Bloc is fairly well known as alum blocks go and is a high end brand you can buy larger blocks at about half the price but it's so long lasting why bother? Still since it's rather expensive I dropped a star (while well worth it, in fact I might change it to 5 stars... mhmm). You can use this pre-shave with electrics to improve glide and post-shave instead of alcohol based aftershave. I like to use some on my fingers before I shave as it improves my grip on my skin. Overall I recommend the use of any alum block, especially this one. Especially if you have sensitive skin which alcohol doesn't help.

## Frequently Bought Together

- Bloc Osma Alum Block, 2.65 Ounce
- Astra Platinum Double Edge Safety Razor Blades,100 Blades (20 x 5)
- Proraso Shaving Soap

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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-02-19*