Most of us choose soap in much the same way we choose a bottle of wine.
A fragrance we like, a colour that catches our eye, a recommendation from a friend, a familiar brand, a label or packaging that catches our eye, yet these things tell us surprisingly little about the soap itself.
Two bars may look similar, smell similar and even contain similar ingredients, yet behave very differently in use. The purpose of this guide is not to tell you which soap to buy, it is to help you understand why different soaps exist, what they were created to do and why some traditions have survived for centuries whilst others disappeared.
Because once you understand that, choosing becomes much easier.
Soap Was Designed As An All-Purpose Cleaner
Today, many people think of soap primarily as something for washing hands, bathing or showering.
Historically, soap occupied a much broader role; soap was not originally designed as a personal care product, it was designed as an all-purpose cleaner and this is what makes traditional soap so different to the products most of us use everyday.
It explains why Savon de Marseille appears in kitchens, utility rooms, workshops and laundry rooms as often as bathrooms. It explains why the same soap might be used for washing, cleaning and stain removal. And it explains why many traditional soaps still seem surprisingly versatile today.
Why Proper Soap Can Do So Many Jobs
One of the reasons people are often surprised by traditional soap is that it seems capable of doing far more than expected.
At first glance, this can sound unlikely. We have become accustomed to specialist products for every task, each promising to solve a particular problem. Proper soap takes a different approach.
Rather than being formulated around a single use, traditional soaps such as Savon de Marseille were often expected to perform many roles around the home. Families washed with them, cleaned with them, travelled with them and relied upon them for everyday laundry.
This versatility comes back to the way soap works.
Much of the dirt we remove from skin, clothing, dishes and household surfaces contains oils, grease or oily compounds. Water alone struggles to remove these effectively because oil and water naturally resist mixing.
Soap changes that.
A soap molecule has one end attracted to oil and another attracted to water. The oil-loving end attaches itself to grease, oils and oily dirt. The water-loving end remains attracted to water. Soap effectively forms a bridge between the two. Now the oil can be suspended in water and rinsed away.
In simple terms, oil helps remove oil.
This is why the same soap can be used to cleanse skin, remove a food stain from a shirt, wash a floor or tackle grease in a kitchen. The surface may be different, but the underlying cleaning task at hand is often remarkably similar.
Why Isn't Every Soap The Same?
If soap works in broadly the same way, why are there different soap-making traditions?
Because there has never been just one way to make a useful soap. Some makers prioritised versatility, others simplicity, others fragrance, others longevity.
Over time these different priorities produced different traditions, formulations and reputations. What is remarkable is not that the soaps became different, it is that so many of the oldest traditions still survive today. The formulations that worked survived.
Many continue to thrive because they continue to solve real problems and are very good at the task in hand.
Why Does Traditional Soap Feel Different To A Typical High Street Soap?
Most traditional soaps begin life as oils that have been transformed into soap through saponification. Historically, the focus was on creating a durable, effective soap that could perform reliably for everyday washing, many modern high-street cleansing bars are formulated differently.
Some are true soaps and others are syndet bars (synthetic detergent bars). Many contain additional ingredients designed to influence texture, fragrance, colour, foam, appearance or manufacturing efficiency. Neither approach is inherently right or wrong they are simply designed with different priorities.
Traditional soap makers often begin with the question: What oils should we use?
Modern personal care manufacturers often begin with the question: What performance characteristics and price point do we want?
The resulting products can feel very different despite appearing similar on the shelf.
Why Some Soaps Last Longer Than Others
One of the first things many customers notice when switching to traditional soap is how long are soap bars last.
This is often one of the easiest signs of quality to recognise, but it is usually the result of broader decisions about formulation and manufacture. Traditional soap makers were often judged by how well their soap performed, how long it lasted and how reliably it could be stored, transported and used. A bar that dissolved quickly or became soft and wasteful in use was rarely considered desirable.
Part of the answer lies in moisture. Newly made soap contains more water than a soap that has been properly dried or aged. As that water slowly evaporates, the bar becomes harder, denser and less quick to dissolve when used.
This is one reason a well-aged Aleppo Soap or traditional Savon de Marseille can last significantly longer than a younger soap. The soap has simply had more time to dry and concentrate.
Formulation matters too. Different oils produce different types of soap, whilst manufacturing methods influence the density and structure of the finished bar. This is one reason terms such as aged, hard-milled and triple-milled continue to attract attention. Although they describe different processes, they all reflect a similar goal: producing a firmer, more durable soap that delivers more washes from the same bar.
Traditional soap also behaves differently over time. Whilst regulations require use-by or best-before information on labels, a properly made Savon de Marseille or Aleppo Soap does not suddenly become unsafe when that date passes.
Instead, it gradually loses moisture, it becomes harder, sometimes smaller, occasionally more brittle or crumbly, but it remains soap and just as effective at its job.
Visit the Savonnerie du Midi museum in Marseille and you will find historic soaps more than a century old on display. They are fascinating reminders that soap is not a fragile product. In many cases, the biggest change over time is simply the loss of water.
A well-aged soap is not necessarily an old soap. It is often a drier, harder and more concentrated soap. And a drier, harder soap generally lasts longer once it reaches the sink, shower or laundry room.
Why More Foam Doesn't Always Mean Better Cleaning
One of the biggest misconceptions in soap and personal care is that more foam means better cleaning.
It doesn't. Foam is simply trapped air.
Whilst some soaps naturally produce more bubbles than others, foam itself is not what removes dirt. Soap removes dirt because it allows oils and grease to become suspended in water and rinsed away. So why do some products foam so much?
Partly because we have learned to associate bubbles with cleaning. A product that produces abundant foam often feels effective, even when the cleaning performance may be no different from a lower-foaming alternative.
Foam can also encourage us to use more product than necessary. A shower gel that creates a large volume of lather can disappear surprisingly quickly compared to a harder traditional soap.
There are practical considerations too. Creating large amounts of foam often requires additional water and ingredients designed to increase lather. Traditional soaps such as Savon de Marseille frequently produce a lower, creamier lather because they were developed with different priorities.
This does not make one approach right and the other wrong, it simply means that foam, cleansing power, longevity and versatility are not the same thing. A sink full of bubbles may look impressive, but bubbles are not the cleaning mechanism. The real work is being done by soap molecules interacting with oils, grease and water.
Understanding that helps explain why some traditional soaps can appear modest in use whilst delivering excellent cleaning performance.
Why Soap Is Simpler Than It First Appears
One of the most surprising discoveries for newcomers to traditional soap is that many apparently different products are closely related.
Soap flakes are simply soap in a different format. Many customers grate their own from a cube of Savon de Marseille, the flakes are quicker and more of a ready to use format.
Black Soap is made using the same cauldron process. The only difference is the use of potassium hydroxide rather than sodium hydroxide, producing a strong liquid soap rather than a hard bar. At first glance these products appear completely different.
Look a little deeper and they reveal something interesting; Soap makers were often adapting the same underlying idea to suit different uses rather than constantly inventing entirely new products. The more you learn about soap, the simpler it often becomes!
The Formulations That Worked Survived
Thousands of soap formulations have existed throughout history, most of which have disappeared, a relatively small number survived.
These traditions survived not because they were fashionable, but because generation after generation continued to find them useful and effective. Many continue to thrive today because they still solve real problems and those are the basis of all the soaps you will find in our store.
Choosing The Right Soap
Choosing the right soap is about selecting the one that does the job you need it to do, not the one with the longest list of claims.
Understanding why different soaps exist, what they were designed to do and how they evolved is often the simplest way to choose between them.
The more you learn about soap, the more remarkable it becomes that some of the most longstanding historic formulations ever created are also among the simplest and most effective still today.
What Should You Look For In A Soap?
There is no single ingredient or label that automatically makes one soap "better" than another. We have been helping customers choose traditional soap since 2012 and the most frequent question we ask or aim to identify is: What do I want this soap to do?
If versatility is your priority, look for simple traditional soaps that were developed for use throughout the home, such as Savon de Marseille.
If simplicity matters most, look for shorter ingredient lists and formulations with few added fragrances, colourants or specialist additives.
If fragrance is part of the pleasure, focus on the quality of the soap first and the fragrance second. A well-made Provence soap remains a well-made soap whether scented with lavender, rose or opium.
If longevity is important, look for dense, well-made soaps that have been properly aged, dried or milled.
If you are comparing ingredient lists, remember that the first few ingredients often tell you far more about a soap than the marketing on the front of the packaging.
Most importantly, try to understand what the soap was designed to do. The differences that matter are often found in the formulation, the manufacturing process and the traditions behind the soap rather than the promises printed on the packaging.