Savon de Marseille: A Guide to the Authentic Olive Oil Cube
Provence Traditions
Some soaps are products. Savon de Marseille is a piece of French history you can hold in your hand. The heavy olive-green cube, stamped on every face and scented with nothing but its own olive oil, has been made in the South of France for more than six hundred years, and the rules that protect it are older than most countries. This guide covers what Savon de Marseille actually is, why the number 72 matters so much, how to recognize an authentic cube when you see one, and how to use it so that a single block lasts for months.
What is Savon de Marseille?
Savon de Marseille is a traditional hard soap from the Marseille region of Provence, made by cooking vegetable oils, historically olive oil, with soda ash from Mediterranean sea plants in large cauldrons. The method arrived on the French coast centuries ago, carried west along trade routes from the older soap-making cities of the Levant, and Marseille turned it into an industry. By the 1600s the city's soap was famous across Europe, and demand grew so fast that the crown stepped in to protect its reputation.
In 1688, a royal edict signed under Louis XIV set the rules that still define the soap today: it had to be made in the traditional cauldron method, and it had to use pure olive oil, with no animal fats of any kind. A soap that broke the rules lost the right to the name. That edict is why an authentic cube today is still a shockingly simple thing. Olive oil, water, soda, salt. No preservatives, no synthetic fragrance, no colorants, nothing that was not in the kettle three centuries ago.
The result is a soap that is naturally gentle, biodegradable, and remarkably versatile. French households have used the same cube for washing hands, faces, and bodies, for laundering delicate linens, and for cleaning nearly everything else, for generations. It is one of the few beauty traditions that predates the beauty industry entirely.
Why 72 percent olive oil is the magic number
Look closely at a true cube of Savon de Marseille and you will find the same phrase stamped into its faces: 72 percent d'huile, 72 percent oil. That number is the heart of the tradition. After the long cauldron cooking and washing process, the finished soap must contain 72 percent oil by weight, a standard formalized in the 19th century that became the guarantee of quality. At 72 percent, the soap is hard, long lasting, and mild, with a high concentration of the oleic acid that makes olive oil so compatible with skin.
The number is not a marketing flourish. Below it, a soap is softer, dissolves faster, and cleans more harshly. At it, the bar keeps its shape in a wet soap dish, produces a low, creamy lather, and rinses clean without stripping. This is why the figure survived three centuries of soap-making fashion, and it is why we build our own everyday bars around the same standard. Every Averal Provence bar is made with 72 percent organic olive oil, the traditional proportion carried into a modern bar. You can read more about what that concentration does for dry and sensitive skin in our guide to olive oil soap benefits and why 72 percent matters.
The stamp is not decoration. For three hundred years, 72 percent has been the promise pressed into every face of the cube.
How to spot an authentic cube
Because the name Savon de Marseille was never given full legal protection, the market is full of soaps that borrow the label without following the recipe. Most of the soap sold under the name today is not made anywhere near Marseille. Here is what to check before you buy.
The stamp on the faces
An authentic cube is stamped on its faces, traditionally all six, with the oil content and the maker's mark. The stamping is done while the soap is still fresh, and on a hand-finished cube you can see slight variations from block to block. A perfectly uniform, unstamped brick wrapped in glossy packaging is a reproduction of the look, not the soap.
An ingredient list you can read aloud
The classic olive oil cube contains saponified olive oil, water, salt, and soda. That is the whole list. If you see palm oil high in the list, added perfume, EDTA, or colorants on a soap sold as a traditional Marseille cube, the tradition has been left behind. The natural color tells the same story: real olive oil soap is a deep, mottled green that fades toward sage as the cube cures and ages. A bright white cube is made from other oils; a neon one is made from other intentions.
Weight, and where it is made
A real cube is dense. The traditional 300 gram block feels heavier than it looks, because it is packed with cured soap rather than air and water. And origin matters: only a handful of soap makers in the Marseille region of the South of France still cook soap the historic way. Our own Olive Oil Traditional Savon de Marseille is a 300 gram cube from Provence, shaped, cured, and stamped by hand in the centuries-old tradition.
How to use a Marseille cube
The cube rewards a little ritual. For hands, face, and body, wet the soap and work it briefly between your palms; the lather is lower and creamier than a modern detergent bar, which is exactly right. It cleans gently, rinses completely, and leaves none of the tight, squeaky feeling that harsher soaps mistake for cleanliness. Many French families keep one cube at the kitchen sink and one in the bath, and the same block serves both without complaint.
Beyond the bathroom, the cube is a quiet workhorse. Rubbed directly on a dampened stain, it lifts grease and grass marks before a wash. Shaved into flakes, it becomes a laundry soap gentle on wool, silk, and baby clothes. A dry corner of the cube run along a sticking drawer or a squeaking hinge is an old Provencal trick that still works.
To make it last, treat it like the dense block it is. Keep it on a dish that drains, out of standing water, and let it dry between uses. Cared for this way, a 300 gram cube in daily use lasts for months, which is part of why this soap has always made sense to practical households: the price of the cube spreads across a very long life.
The cube and its cousins
Savon de Marseille sits in a family of great olive oil soaps. Its ancestor is Aleppo soap, the olive and laurel oil block whose method traveled from the eastern Mediterranean to the coast of France centuries ago; the Marseille cube is what that recipe became in Provencal hands. We carry an authentic Aleppo soap for anyone who wants to meet the original.
Its modern descendant is the French triple-milled bar. Triple milling takes a cured olive oil soap and presses it three times through steel rollers, producing a smoother, denser, longer lasting bar with a finer lather and room for essential oils from Grasse. It is the same 72 percent olive oil tradition, refined for the daily shower. If you want the full story of how the two methods differ, our guide to what triple-milled soap is walks through it step by step.
Questions we hear about the cube
What is the difference between the green cube and the white cube?
Both exist within the tradition, and they are different soaps. The green cube is the original, made with olive oil, and it carries the color, the soft vegetal scent, and the skin-softening character that made Marseille soap famous. The white cube is a later variation made with other vegetable oils, harder and more neutral, historically favored for laundry. If you are buying for your skin, the green olive oil cube is the one to look for.
Is it suitable for sensitive skin?
This is the soap French families have reached for precisely when skin is fussy. With no added fragrance, no colorants, and no preservatives, there is very little in the cube to react to, and the high olive oil content keeps the cleanse mild. As with any soap, if you have a diagnosed skin condition, your dermatologist knows your skin better than a soap maker does.
Why does the cube smell so plain?
Because nothing is added to it. The gentle, slightly green scent of an authentic cube is simply the smell of cured olive oil soap, and it fades from skin within minutes of rinsing. That plainness is the point: it will never compete with your perfume, and it never wears out its welcome at a sink used by the whole household. When you do want scent, that is what our perfumed bars with essential oils from Grasse are for.
Bringing the tradition home
Our traditional cube sells through nearly every time it arrives from Provence, and it is currently sold out. If you want one from the next arrival, open the Olive Oil Traditional Savon de Marseille page and tap Notify me when available; that list is filled first, in order.
In the meantime, the closest thing to the cube in our collection is the bar we built in its image: the Olive Oil Soap Bar, triple milled in the South of France with 72 percent organic olive oil, unadorned and true to the original. It is the same tradition, sized for your shower.
