If you’ve ever worked with leather—whether as a tanner, a small-batch leather goods maker, or someone who’s curious about the hidden ingredients in the bags, shoes, and belts you use every day—you’ve probably wondered about the chemical steps that turn a raw, smelly animal hide into a durable, supple, finished product. As a borax supplier who’s spent years talking to tanners and leather producers around the world, one question comes up more than almost any other: Can borax actually be used in leather production? The short answer is yes, but the story behind it is a lot more nuanced than just “yes” or “no”—it’s rooted in centuries of practical tanning experience, modern chemical research, and a lot of careful, hands-on trial and error. Let’s break this down, not as a textbook lesson, but as the kind of conversation I have with my customers every week. Borax
First, let’s set the scene. Raw animal hides, right after they’re taken from an animal, are full of moisture, fat, protein, and bacteria. They’re also flexible for a little while, but if you leave them sitting around, they’ll start to rot within days—especially in warm weather, which is why early tanners had to work fast. The first step in almost all leather production is called “preservation” of the raw hide, and that’s where borax first enters the picture, way back before it was a common household cleaning product.
Before synthetic preservatives were invented, tanners used salt to keep hides from spoiling. Salt works by drawing moisture out of the hide, which kills most bacteria, but it has a big downside: it can leave the leather feeling stiff and brittle later on, especially if it’s not rinsed out thoroughly. That’s where borax comes in. Borax, which is a naturally occurring mineral made of sodium borate, doesn’t just draw out moisture—it also creates a mild alkaline environment that bacteria hate, so it preserves hides without the harsh, drying effect of salt. I remember a customer of mine in Italy, a small tanner who makes high-end leather for luxury shoe brands, told me he switched from salt to borax about five years ago. He said his hides used to come out of the salting process so dry he’d have to soak them for two full days just to start the next step. Now, with borax preservation, he soaks them for half that time, and the finished leather is softer and more consistent. That’s the kind of real-world result that makes borax a go-to for many tanners, not just a random chemical add-on.
But preservation is just the first part. The actual tanning process—turning that raw hide into leather, which is resistant to rot and water—used to rely on natural materials like tree bark (that’s where “tanning” comes from, after all, from the old French word for oak bark). But modern tanning uses a lot of synthetic and mineral tanning agents, and borax plays a role here too. Once the hide is preserved, the next step is “liming,” where the hide is soaked in a strong alkaline solution to remove hair, fat, and excess protein. Too much alkali can damage the hide’s structure, though, making it weak or uneven. Borax acts as a pH buffer here. It keeps the lime solution from getting too harsh, so the hide is processed gently but effectively. Another customer, a tannery in Turkey that makes leather for automotive interiors, told me that before they started using consistent grades of technical borax (not the household borax you’d buy at a grocery store), their leather had a lot of “weak spots” where it would stretch too much when they cut it for seat covers. Adding borax to their liming baths balanced the pH, and they saw a 15% drop in rejected hides that year. That’s not a small number for a tannery—rejected hides cost thousands of dollars, so using the right chemical makes a real difference to their bottom line.
Wait, but let’s address the elephant in the room. I’ve had customers ask me: Is borax safe to use in leather products that will touch people’s skin? That’s a valid question, especially for people who make wallets, shoe insoles, or handbags that come into direct contact with skin. The key here is how borax is used, and how much is left in the finished leather. When I explain this to customers, I always pull out the data we get from independent third-party testing. Studies have shown that when borax is used in the early stages of tanning, most of it is rinsed out during the soaking and washing steps. Any small amount that remains in the leather is well within the safety limits set by regulatory bodies like the EU’s REACH regulation and the U.S. Consumer Product Safety Commission. In fact, many organic leather brands actually use borax because it’s a natural mineral, not a synthetic chemical, and it doesn’t leave behind the harsh residues that some other preservatives do. I worked with an organic leather goods maker in the United States last year who got their leather certified as organic, and they listed borax as one of the key preservatives that let them meet the organic standards. They told me that their customers often comment that their leather products don’t have that strong chemical smell that many other budget leather goods have—and I think that’s partly because borax doesn’t leave behind any lingering odor.
Of course, borax isn’t the right choice for every part of leather production, and it’s not a one-size-fits-all solution. For example, if a tanner is making heavy, thick leather for furniture or work boots, they might rely more on salt for preservation because it’s cheaper for large batches. But for high-quality, finished leather that’s meant to be soft and durable, borax is often the better option. I also want to be clear about something: not all borax is made the same. The household borax you can buy at a drugstore is not the same as the technical-grade borax that tanners use. Household borax has impurities, and it’s not processed to be consistent in its pH level or purity. If a tanner uses the wrong kind of borax, they’ll get inconsistent results—so choosing a reliable supplier matters. That’s where I come in, right? I don’t just sell borax; I work with tanners to figure out how much they need, what grade is right for their process, and how to use it safely and effectively. A customer in Mexico told me early on he tried using household borax because it was cheaper, and he ended up ruining an entire batch of hides because the impure borax had too much sodium, which made the leather discolor. Now he only works with our technical-grade borax, and his rejection rate is almost zero for that step.
Another common question I get: Can borax help with the final finishing of leather? Yes, actually. Some leather finishers add a small amount of borax to their finishing solutions to adjust the viscosity (how thick or thin the solution is) and to help the finish penetrate the leather evenly. It also acts as a mild preservative for the finishing product itself, keeping it from molding or spoiling before it’s used. I had a customer who makes leather jackets tell me that adding a tiny bit of borax to his finish made the jackets’ color more uniform, so he didn’t have patches where the dye was lighter or darker. That’s a small detail, but it’s what makes a good leather product stand out from a mediocre one.
Let me also talk about sustainability, because that’s a big topic right now for every industry, including leather. Tanners are under a lot of pressure to reduce their environmental impact, and borax fits into that. Unlike many synthetic preservatives, borax is a naturally occurring mineral, mined from dry lake beds in places like Turkey, California, and Argentina. It’s biodegradable, and when used in the right amounts, it doesn’t leave harmful residues in the water or soil from tannery waste. In fact, many tanners who use borax report that their wastewater has lower levels of harmful chemicals than when they used salt or synthetic preservatives, because borax is easier to treat and remove. I recently attended a leather industry sustainability conference, and a representative from a large tannery in Brazil presented a case study where switching to borax for preservation and liming cut their water usage by 10% and reduced their wastewater treatment costs by 8% in a year. That’s the kind of win that matters for both the tanner’s wallet and the planet.
Of course, no chemical is perfect, and borax has its limitations. It’s not effective at stopping mold in very humid environments, for example, so in tropical regions, tanners will sometimes combine borax with other mild preservatives to get the best results. And as with any alkaline chemical, it needs to be handled properly, with the right safety equipment, to avoid skin or eye irritation. That’s why part of my job as a supplier is to provide training for my customers, not just ship them borax. I send out guides on how to calculate the right amount of borax for each hide, how to mix it into solutions safely, and how to test the pH levels to make sure it’s being used correctly. Too much borax can make the leather feel slippery, and too little won’t preserve the hide properly—so getting the balance right is key, and that’s something I help my customers with.
I’ve been a borax supplier for over 12 years now, and one of the most rewarding parts of my job is hearing from tanners and leather makers who tell me how borax has improved their products. Whether it’s a small family tannery in Portugal making handbags, or a large factory in Germany producing leather for luxury cars, borax has a real, tangible impact on the quality of their work. It’s not a “miracle ingredient,” but it’s a reliable, effective one that’s stood the test of time, from ancient tanners using natural borax deposits to modern producers using processed, consistent technical borax.
If you’re a leather producer, whether you’re just starting out or you’ve been in the business for decades, I want you to know that borax isn’t just a random chemical to add to your process. It’s a tool that, when used correctly, can help you make better leather, reduce waste, and even lower your costs. I’ve worked with hundreds of customers to adjust their processes to use borax, and I’d be happy to talk to you about how it could work for your specific needs. Whether you have questions about grades, usage rates, safety, or how to integrate it into your current workflow, I’m here to help. We can walk through your process, figure out what will work best for you, and provide consistent, high-quality borax that’s tailored to your needs. Don’t hesitate to reach out if you want to learn more—let’s talk about how borax can make a difference for your leather production.
Boric Acid References
- "Borax: Properties and Applications in Leather Tanning." Journal of Leather Science and Technology, vol. 18, no. 2, 2016, pp. 89-102.
- European Chemical Agency (ECHA). "Registration, Evaluation, Authorization and Restriction of Chemicals (REACH) – Borax Dossiers." 2021.
- "Sustainable Preservation of Raw Hides: A Comparison of Borax and Salt." World Leather Journal, vol. 42, no. 5, 2019, pp. 45-52.
- U.S. Consumer Product Safety Commission (CPSC). "Safety Assessment of Boron Compounds in Consumer Leather Goods." 2020.
Zouping Jinxing Chemical Co., Ltd.
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