Hey there, I’m Jake, and I’ve been in the borax supply game for almost 10 years now. Most days, I get asked everything from “Can I clean my toilet with this stuff?” to “Wait, is borax even safe for my veggies?” But last month, a candle maker slid into my DMs and hit me with a question that made me pause: “Can borax be used to make candles?” Borax
At first, I’ll admit, I was a little confused. Borax’s whole thing is being that multipurpose cleaning and laundry helper—we supply it to farmers, craft hobbyists, even small beauty brands, but candle making? That’s not the first use that comes to mind when you hear “sodium borate.” But over the last 30 days, I’ve talked to a dozen candle makers, tested a few things myself in my garage workshop, and dug into the actual science (no, I didn’t sleep through high school chem—promise). Let’s break this down straight, no fancy jargon, no clickbait.
First, let’s get the basics of candle making down, because if you don’t know that, you won’t get why someone would even mix borax in. Candles are basically wax, a wick, and sometimes additives to tweak how they burn, smell, or look. Your basic taper candle, for example, is meant to burn slow and evenly—no tunneling, no dripping all over your table. Tunneling is the #1 complaint most candle makers tell me about; you light a jar candle, burn it for an hour, and only a little of the wax melts in the middle, leaving a big ring of solid wax around the edges, so the whole thing dies fast.
Now, what’s borax again? It’s a naturally occurring mineral, mined right from the earth—we source ours from Nevada’s Great Salt Lake, which means it’s 100% non-synthetic, no weird fillers. Chemically, it’s sodium tetraborate decahydrate, but you can just call it borax. And here’s where the candle maker’s question ties in: borax has some super specific properties that make it actually useful for two big parts of candle making—wick preparation and wax stability.
Let’s start with wicks, because that’s the boring part no one talks about but is make-or-break. Wicks are usually made of cotton or hemp, right? If you don’t prep them right, they’ll get too soggy, burn unevenly, or even go out mid-burn. I heard a candle maker say she was testing borax for wicks, so I grabbed a few plain cotton wicks, dipped them in a solution of warm water and borax, let them dry completely (like, 24 hours dry—don’t skip that step, the water will mess up your wax), then used them to make a small batch of beeswax candles.
The difference was insane. Normally, un-prepped wicks would start smoking after 15 minutes, or leave black soot all over the glass. The borax-prepped wick? Burned for 2 hours straight, almost no soot, and the flame stayed consistent. Why does that work? Borax acts like a heat-resistant coating on the wick. When the wick burns, the borax melts a little and forms a tiny ceramic-like layer that keeps the wick from curling too much (curly wicks = uneven burning) and prevents it from getting over-saturated with melted wax. It’s basically a cheap, natural alternative to the chemical wick treatments most big candle brands use. I tested it with soy wax too, which is way softer than beeswax—soy wicks tend to be more prone to tunneling, but the borax prep fixed that too.
Next, what about adding borax directly to the wax? Not everyone’s testing wicks—some candle makers want to tweak the wax itself. I talked to a small batch maker in Portland who’d been adding a tiny amount of borax to her container candles, and she said it cut her tunneling rate by like 70%. I wanted to make sure that wasn’t just her biased opinion, so I did a side-by-side test. Two identical jars, same soy wax, same wick, same fragrance oil. Jar 1 had no borax, Jar 2 had 0.5% borax by total wax weight (super small amount—too much and you’ll get weird cloudiness, I’ll warn you).
Jar 1 burned for 3 hours, tunneling halfway up the jar—had to dig out the leftover wax with a spoon after. Jar 2? Burned the entire surface of the wax evenly, no tunnel at all, and only left a tiny bit of wax at the bottom when it was done. Why does that happen? Borax is a water-soluble mineral, and when it’s mixed into melted wax (wait, you have to melt it first, by the way—don’t just dump dry borax in cold wax), it acts as a viscosity modifier. Viscosity is just a fancy word for how thick a liquid is. Soy wax is thin when melted, so it doesn’t spread across the whole top of the container easily. Borax thickens it just enough that it stays liquid across the entire surface while burning, instead of sinking to the edges. I will say, though—don’t go over 1% borax. I tried 1% in a test candle, and the wax got super cloudy, which is not what you want for a nice candle. 0.25% to 0.75% is the sweet spot, depending on your wax type.
Wait, but hold up—we can’t skip the safety part, right? As a borax supplier, I get asked all the time if anything we sell is safe to use around the house. Let’s cut through the fear-mongering: the FDA says borax is safe for limited, indirect household use, but you shouldn’t ingest it, and you should take basic precautions when using it in candle making. Here’s the lowdown: when you’re prepping wicks, just wear gloves if you want—borax can irritate sensitive skin if you’re handling it a lot, but most people don’t have issues. When adding it to wax, work in a well-ventilated area (same as any candle making—melted wax fumes aren’t great to breathe in) and don’t let the wax get hotter than like 180°F, because high heat can make borax release tiny amounts of dust that you don’t want to inhale. Also, never add dry borax to melted wax—you’ll get little specks that burn weird, and it’s a fire hazard if the borax dust catches a spark. Mix it into a small amount of warm water first, stir it all the way until it’s fully dissolved, then add that solution to your melted wax. That’s the safe way.
I’ve had a few people ask me if borax can make candles longer-lasting or brighter. To answer that: not really. Borax doesn’t affect burn time length on its own, but it does prevent tunneling, so you’ll use 100% of the wax instead of wasting half. And the flame is a little steadier, so it looks brighter than a candle with a wick that’s flickering or smoking. That’s not a miracle, but it’s a nice perk for someone who’s tired of throwing away half-used candles.
Wait, has anyone tried using borax for other candle-related stuff? I heard one craft blogger use a borax solution to remove frost from taper candles—like, you dissolve a little borax in hot water, dip the candle in for 10 seconds, and it makes that frosted, vintage look without adding extra paint or glitter. That’s a fun side use, too, even if it’s not core to making the candle itself.
Now, before I wrap this up, let’s be real—borax isn’t for every candle maker. If you’re making super fancy luxury candles with specific wax blends, you might already use other additives like stearin or paraffin modifiers that work too. But if you’re a small batch maker, a hobbyist, or someone looking for a natural, budget-friendly tweak to fix tunneling or wick issues, borax is worth testing. It’s way cheaper than most commercial wick treatments, and it’s 100% natural, so if you’re making candles for people with sensitive noses or skin, that’s a big plus.
As a borax supplier, we work with candle makers all the time, and this is one of the questions that’s been popping up more lately. If you’re a candle maker, a hobbyist, or just curious about how borax works for different projects, hit us up to talk details. We can send you sample sizes so you can test it out in your own workshop, no pressure. Whether you need small amounts for a one-off batch or bulk for your small business, we’ve got you covered.
Wait, one last thing to make sure I didn’t miss: a lot of people ask if borax candles smell different. No, the amount we use is so tiny that it won’t interfere with your fragrance oil. I tested that too—same fragrance load in both candles, the one with borax smelled exactly the same as the one without. You won’t get a weird chemical or mineral smell, promise.
Magnesium Sulfate I think that’s all the real info, no fluff, no misinformation. Borax isn’t some secret candle magic, but it’s a solid, underrated tool for anyone looking to up their candle game, fix that annoying tunneling, and get a more even burn. If you’re ready to test it, or if you have questions about how to use it for your specific candle project, reach out to us for a chat. We’ve got the supply, and we’ve got the knowledge to help you make whatever you’re working on turn out right.
References
- U.S. Food and Drug Administration. (2023). GRAS (Generally Recognized As Safe) Substances Database.
- American Chemical Society. (2022). The Properties and Uses of Borax.
- National Candle Association. (2021). Candle Making Best Practices for Wick Preparation and Wax Additives.
- International Journal of Cosmetic Science. (2020). Natural Mineral Additives for Modified Wax Consistency in Home Candle Production.
Zouping Jinxing Chemical Co., Ltd.
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