When your candles burn down to nearly nothing, you can melt them together and create new candles. Follow these steps to make your own.
Rachel Feltman for Popular ScienceYou’ll need to separate the wax from the containers it’s stuck to so you can melt and reshape it. The exact process will depend on what candles you’re working with and what shape they’re in.
Have candle scraps that are already free from their holders? You can skip this step entirely. If your candles have melted into fragile candlesticks, try putting the candlesticks into the freezer for several hours before gently prying at the wax with a gentle implement, like a chopstick from a takeout order.Place the jars open-side-up in the shallow pan or baking sheet. You’ll want to sit the pan on something that won’t get damaged by heat. You can place it on your stovetop, a wooden cutting board, or an oven mitt to protect your countertops. Pour some of the water into the pan so it surrounds the jars. Let the water get as high as it can without risking a dangerous spill. Leave this setup alone for about an hour. By then, the wax should have separated from the bottom of the jar, floated to the top, and cooled and hardened once again, making it easy to pull out. Put the wax aside to use later. If some of the wax is still stuck, try jostling it with a popsicle stick or chopstick to loosen it, then repeat this process again. If you’re only recycling unscented candles of the same color, you can skip right to Step 3. If you’re recycling a whole mess of different candles at once, stop and consider whether you might want to separate them into batches. Are there any scents involved, and will they play nice together in your new candle? If there are multiple colors, are you alright with them combining into a muddy brown? Follow your heart!Wax and soy candles play pretty well together when they’re melted down, though they’ll melt at different speeds and require stirring.You can reuse old candle jars or use fresh tins from a candle making kit. Most wicks come with double-sided stickers. Peel off one side and place the sticker in the center of a candle vessel. Unpeel the other side and stick the metal base of the wick on top.Rachel Feltman for Popular ScienceThis step is similar to the first step of regular candle making, but with the added concern of contaminants from the used wax. Your spent candles are bound to have bits of wick, metal wick-holders, and even ashy old matches stuck inside them. You don’t want any of that going into your new candles.Fill your saucepan or the bottom of your double boiler about halfway with water . Set it on the stove and place the container of wax scraps inside. If you’re using a bowl, you’ll want the bowl to nest inside the saucepan without touching the water or the bottom of the pan, so the water is simmering beneath it. Set the heat to medium. Allow your wax to melt. This should take anywhere from five to 10 minutes, depending on how much you’re melting and what its composition is. Stir occasionally with your wooden implement to keep things heating evenly. Your melted wax probably looks pretty gritty and gross. Straining impurities out will help your finished candles burn cleaner. They still might not be as clean as fresh wax when you’re done, which is why this recycling hack is especially great for DIY citronella candles—a little extra smokiness will just make them more effective against bugs. Using a fine-mesh strainer or a piece of cheesecloth, strain the wax from the double-boiler into a clean mason jar or glass measuring cup.If you’re using a glass or metal bowl instead of a candle-making pot or a double-boiler with a handle, make sure you use an oven mitt to protect your hands. Melted wax is hot!Rachel Feltman for Popular ScienceIf wax starts to harden onto your measuring cup or mason jar, pop it in the microwave for 30 seconds to loosen the wax up again.Make sure no metal bits from the wax have ended up in the jar before you put it into the microwave! Microwaves can get electric currents going in metal, and metal objects with jagged or pointed edges can produce sparks that pose a fire hazard. Your wax will probably still look a bit murky after straining, especially if you’ve mixed colors. Prioritize getting all the metal wick pieces out. If you want to make citronella candles, add five to 10 drops of citronella oil to the melted wax and stir. You can add other scented oils, too, including old perfume samples. Just make sure to keep the underlying smell of the recycled wax in mind. This is entirely based on your own sensory sensibilities. But for example, a pumpkin pie candle and an apple pie candle will probably combine to smell like baked goods. A pumpkin pie candle and a floral candle will probably just smell confusing and over-perfumed, because those scent profiles are very different and don’t tend to get paired together. A pumpkin pie candle and a smoky leathery whiskey candle might smell great, or it might be a chaotic assault to your senses!If you need to hit the pause button after melting and straining your candles, you can simply take the double-boiler off the heat and allow the wax to cool. It will be ready to use whenever you want it. When you’re ready to pour your candles, reheat the wax using the same method detailed inRemove your melted wax from the heat. If the vessel it’s in doesn’t already have a spout, consider transferring it to a glass measuring cup to make pouring easier.11. Let the candles cure. Ideally, you should place your candles in a relatively warm spot so they cool down very slowly. This keeps them from splitting. As you can see from my photos, my air conditioning was a little too powerful for a smooth cooling process—they’d have come out prettier if I’d put them into the pantry.Rachel Feltman for Popular Science Leave your candles undisturbed for 24 to 48 hours. They may appear hardened much sooner than this, but they’ll last longer if you wait until they’re fully set to burn them.Use your judgment on this one. At best, indoor candles risk, but they’re especially unhealthy if you see them burning black and emitting soot. Because recycled wax has already been through a few burns, it’s liable to already have some soot mixed in . The best and safest way to use recycled candles is for outdoor entertainment, which is why they make great citronella candles. But if your repurposed wax looks super pristine and burns as clean as your fresh candles, more power to you. Rachel Feltman is Editor-at-Large at Popular Science. She hosts and oversees the hit podcast The Weirdest Thing I Learned This Week, and helps to fill the magazine’s digital pages with thrilling features. She lives in Jersey City with her surprisingly tall husband and surprisingly old cat. Contact the author
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