The Tanneries of Fez: The Medieval Chemistry of Leather Dyeing

Section 1: The Chemistry of the Vats (The Process)

Let’s get straight to the science of it, because this isn’t magic—it’s medieval chemistry that has survived for a millennium. When you look down at the honeycomb of vats in Chouara, you are looking at a two-stage chemical reaction that hasn’t changed since the Middle Ages. The process starts with the white vats. This is the “cleaning and softening” phase, and frankly, it is the part that generates the smell that hits you three streets away.

The white vats are filled with a mixture of cow urine, pigeon feces, quicklime, salt, and water. It sounds grotesque, but there is a scientific reason for this cocktail. The pigeon poop contains high concentrations of ammonia. When I explain this to travelers, they are often shocked, but ammonia is a powerful softening agent. It breaks down the keratin in the leather. The hides—usually cow, sheep, goat, or camel—are soaked here for several days. The caustic mixture removes the excess hair and fat, but more importantly, it makes the leather malleable. Without the pigeon poop, that leather jacket you want would feel like cardboard.

The tanners, who often inherit this job from their fathers and grandfathers, stand waist-deep in this mixture. They physically knead the skins with their bare feet for hours. It is grueling, back-breaking work under the North African sun. There are no machines here. No tumblers, no chrome chemicals (which are used in 90% of modern leather but are terrible for the environment). This is organic tanning in its most brutal form. The liming process prepares the collagen fibers to accept the dye. If they rush this step, the leather rots. If they do it right, the leather lasts a lifetime.

Once the hides are softened and cleaned, they are moved to the round stone vessels containing the colored dyes. This is the “pretty” part you see on Instagram, but the chemistry is just as fascinating. They don’t use Pantone chemical packs. They use nature. The red comes from poppies. The blue comes from indigo. The yellow—which is the most expensive leather because the dye is so costly—comes from saffron (or sometimes a mix of turmeric and pomegranate skin for a cheaper variant). Brown comes from cedar wood, and green comes from wild mint.

The skins are submerged in these natural dyes for a week or more. The tanners massage the color into the pores of the hide. Because natural ingredients are used, the colors have a distinct, earthy tone that you cannot replicate with synthetic dyes. This “vegetable tanning” process means the leather develops a patina over time rather than cracking. When I help clients distinguish real Fez leather from cheap imports, I tell them to look at the color inconsistency. Real natural dye isn’t perfectly uniform; it has character, depth, and the story of the poppy or the saffron that made it.

Section 2: Navigating the Tanneries (The Experience)

Visiting the tanneries isn’t like visiting a museum; it’s a contact sport. The Chouara Tannery is located deep in the labyrinth of the Fez Medina, a car-free zone with over 9,000 alleyways. In my 15 years of travel consulting, I’ve seen more people get lost here than in Venice. The “entrance” to the tannery isn’t a front gate. The tannery is surrounded by tall leather shops, and the only way to see the action is to go up to the balconies (terraces) of these shops. This creates a unique symbiotic economy: the shops provide the view, and in return, they hope you buy a jacket.

As you approach the area, you will be swarmed. This is a guarantee. Young men, old men, and sometimes children will tell you ” The road is closed,” or “Big festival today, tannery closed, come with me.” Ignore them. This is the standard hustle. Keep walking. You are looking for signs that say “Terrasse de Tannerie” or Shop numbers like #10 or #64 (popular viewing spots). When you enter one of these shops, do not be alarmed if a guy hands you a sprig of fresh mint. Take it. Do not ask questions.

This mint is your gas mask. You hold it under your nose to mask the ammonia smell rising from the vats. The smell varies by season; in the winter, it’s manageable. In the heat of August, it can be water-your-eyes intense. Once you climb the narrow, winding stairs to the terrace, the view opens up. It looks like an artist’s palette dropped on the ground. You’ll see hundreds of stone vessels filled with white, red, brown, and yellow liquids. You’ll see men hauling wet skins on their backs, donkeys transporting piles of raw hides, and skins drying on the surrounding roofs.

I always advise my clients to spend at least 20 minutes up there. Don’t just snap a selfie and leave. Watch the workflow. Notice how the water flows from one vat to another. Watch the hierarchy—the younger men are usually in the white vats (the hardest work), while the older, more experienced masters handle the dyeing. It’s a living organism. The shopkeepers will start explaining the process to you. They are generally knowledgeable because they grew up in this neighborhood.

A specific scenario to watch out for: “The Guardian Fee.” Sometimes, a person at the door might ask for a small fee (10-20 Dirhams) to enter the shop if you don’t buy anything. This is fair. They are maintaining the building and dealing with hundreds of tourists. However, if someone on the street demands money just to point at the door, that is a scam. I recently had a couple who paid 200 Dirhams to a “guide” just to walk them 50 meters. Don’t be that person. Walk with confidence, head up, and if you get lost, ask a shopkeeper inside a store, not a guy loitering on the corner.

Section 3: Buying Leather (The Transaction)

If you are in Fez, you are probably going to buy leather. It’s the souvenir. But buying here requires mental preparation. This is not a fixed-price department store; this is the Olympics of haggling. The shopkeepers are professionals. They do this every day; you do it once a year. But you can win if you know the rules. First, determine what you actually want. A pouf? A jacket? A weekend bag? Do not show enthusiasm. If you pick up a bag and gasp, “Oh, I love this!” you just added 50% to the price. Look at it with skepticism.

Check the quality. Real leather from these tanneries smells like leather—earthy, maybe a tiny bit funky, but rich. If it smells sharply of chemicals or gasoline, it was likely tanned in a modern factory and imported, or rush-tanned using bad chemicals. Avoid it. Test the zipper. Look at the stitching—is it double stitched? Pull the seams slightly. If you see daylight, put it back. A common trick is to use high-quality leather but terrible hardware (buckles and zips) that break in a month.

Now, the price. They will give you a “first price.” This number is fiction. It is usually 3 to 4 times the actual value. If they say 2000 Dirhams, the real price is likely around 600-800. Your counter-offer should be shockingly low. Offer 30% of their asking price. They will act offended. They might clutch their chest. It’s theater. Enjoy it. Slowly work your way up while they work their way down. If you get stuck, use the “Walk Away” technique. Say, “It’s too much for me, thank you,” and slowly walk towards the stairs. 80% of the time, they will call you back with a much better price.

Let’s talk about shipping. I often arrange itineraries for people who buy rugs and leather. The shops will offer to ship it home for you via DHL or FedEx. In reputable shops (the big ones with the terraces), this is generally safe. They fill out the tracking forms right there. However, for smaller items, I recommend carrying them with you. There is nothing worse than waiting 3 months for a jacket that gets stuck in customs.

Finally, understand the difference between goat, sheep, and cow leather. Sheep is soft and used for jackets. Goat is tougher and used for bags and poufs. Cow is heavy and rigid, used for belts and soles. I once helped a client who bought a “Camel leather” jacket that was actually just stiff cowhide. Real camel leather is rare and very expensive. If the price is too good to be true, it’s not camel. Authentic Fez leather is an investment, but compared to Italian boutique prices, it’s a steal—if you play the game right.

Frequently Asked Questions

1. Is the smell really that bad at the Fez Tanneries?

This is the most common question I get from clients planning a trip to Morocco. The short answer is: Yes, but it’s manageable. The smell is a pungent combination of ammonia (from the pigeon droppings), decay (from the raw hides), and dampness. It is a biological odor that triggers a primal reaction in some people. However, the intensity depends heavily on two factors: the temperature and your proximity to the vats.

In the winter months (November to February), the smell is significantly reduced because the heat isn’t cooking the vats. During the summer (July and August), when temperatures in Fez can hit 40°C (104°F), the odor is thick and heavy. This is why the mint sprig is essential. The shopkeepers hand it to you for a reason. You crush the leaves slightly to release the oils and hold it right under your nose.

It’s also worth noting that you get used to it after about five minutes. It’s the initial shock that hits you. I’ve visited dozens of times, and now I barely notice it, but I’ve seen tourists with sensitive stomachs gag. If you are pregnant or highly sensitive to smells, you might want to view the tanneries from a higher, more distant terrace rather than the ones directly looming over the pits. But don’t let the fear of the smell stop you—it’s part of the authentic experience.

2. Do I need a guide to visit the Tanneries?

Absolutely not, and in fact, I often recommend against hiring a “street guide” specifically for this. Here is the reality of the Fez Medina: it is full of unofficial guides who will try to intercept you. They will tell you that the tanneries are hard to find (true) and that you need them to get in (false). The tanneries are free to view.

The business model of the tanneries relies on the surrounding leather shops. These shops have open terraces. They want you to come in. They want you to climb their stairs, look at the view, and then walk through their showroom on the way out. You do not need a guide to facilitate this. You just need to walk into a shop. If you have hired an official certified guide for a full-day city tour (which I do recommend for historical context), they will take you there naturally.

However, if you are solo, just use Google Maps or follow the flow of tourists. If you hire a random guy on the street, he will take you to a specific shop where he gets a commission on anything you buy. This means the price of your leather jacket just went up by 20% to cover his cut. Go independently, interact with the shop owners directly, and save your money for the shopping.

3. Is the tanning process ethical and safe for workers?

This is a heavy question and one that requires an honest, nuanced answer. From a Western health and safety perspective? No, it is not “safe.” The workers are standing in mixtures of lime and ammonia without protective gear. They work long hours in the sun. It is physically demanding labor. You will see men with stained skin and likely respiratory issues from long-term exposure to the fumes.

However, from a cultural and economic perspective, the tanneries are a vital source of income and pride. These jobs are often hereditary, passed down through families for centuries. The workers are organized into guilds, and they are generally paid better than unskilled laborers in other sectors. The tanneries support hundreds of families in the Medina.

As a traveler, you have to weigh this. By visiting and buying leather, you are supporting this traditional economy and keeping the artisan craft alive. If the tourists stop coming, these families lose their income. I always encourage my clients to tip the workers if they go down near the vats (though usually, you stay on the terrace), and to buy from the cooperatives that ensure fair distribution of profits. It is a gritty reality, but it is their reality.

4. How do I tell if the leather is goat, sheep, or cow?

Knowing your leather types is the best defense against overpaying. In Fez, you will primarily encounter three types: Sheep (Mouton), Goat, and Cow. Occasionally, you will hear claims of Camel leather, but be skeptical.

Sheepskin: This is the softest. It feels almost like fabric. It is lightweight and pliable. It is perfect for fashion jackets that you want to wear in mild weather. However, it is delicate. It tears easier than the others.

Goatskin: This is the gold standard for durability in Morocco. It has a more pronounced grain (texture) than sheepskin. It is tougher, more water-resistant, and holds its shape better. This is what you want for travel bags, poufs (ottomans), and slippers (babouche). It smells stronger than sheepskin initially.

Cowhide: This is thick, stiff, and heavy. You can tell immediately by the weight. It is used for belts, heavy bags, and shoe soles. It is the cheapest of the three.

The Fire Test: You might see sellers hold a lighter to the leather to prove it’s real (plastic melts, leather doesn’t). This is a show. Real leather won’t burn immediately, but it can still scorch. Rely on your nose (smell the earthiness) and your touch. If it feels plasticky or too perfect, it’s not the real deal.

5. What is the best time of day for photos?

For the best photography, you want to visit in the morning, ideally between 9:00 AM and 11:00 AM. There are two main reasons for this: light and action.

The Light: The Medina walls are high, and the tanneries are essentially courtyards. In the early morning or late afternoon, deep shadows can cut across the vats, making exposure difficult for your camera (one half is bright white, the other is pitch black). In the mid-morning, the sun is high enough to illuminate the colors of the dye vats—the reds and yellows pop vibrantly—but not so harsh that it washes everything out.

The Action: The tanners start early. By 9:00 AM, the vats are buzzing with activity. Men are stomping, hauling, and dyeing. If you go at 1:00 PM or 2:00 PM, especially in the summer, the heat is unbearable, and many workers take a break or the activity slows down. The vats might be still. You want to capture the movement, the water splashing, and the labor.

Pro Tip: Bring a zoom lens if you have one. You will be shooting from a balcony looking down. A standard phone camera is okay, but a zoom allows you to capture the details of the workers’ faces and the texture of the skins without intruding on their space.

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