Why Are My Soy Candles Frosting? (And How to Prevent It)

Why Are My Soy Candles Frosting? (And How to Prevent It)

You’ve perfectly measured your fragrance oil, centered your wicks, and poured your wax at the exact right temperature. But a few hours later, as your beautiful new candles cool on the benchtop, you notice white, snowflake-like patches forming on the top and sides of the wax.

Welcome to the frustrating world of candle frosting.

If you are a candle maker, especially one working with natural soy wax here in Australia, you will eventually encounter frosting. At Australian Luxury Candle Supplies, we get asked about this phenomenon almost every week.

Here is the good news: you haven’t ruined your batch! Let’s dive into what frosting actually is, why it happens, and how you can prevent it in your next pour.

What Exactly is Frosting?

Frosting (sometimes called "polymorphism" by chemists) is a natural characteristic of 100% pure soy wax. Those white, chalky patches are simply the natural wax crystals trying to return to their original, stable state.

It is important to remember that frosting is purely an aesthetic issue. It does not mean your wax has gone bad, it does not mean your fragrance oil is faulty, and most importantly, it does not affect how your candle burns or how it smells. In fact, many luxury buyers look for a slight frost as proof that the candle is made from natural, eco-friendly soy wax rather than a petroleum byproduct.

However, if you are aiming for a flawless, creamy finish for your brand, frosting can be a nuisance.

Why Does Frosting Happen?

Frosting is almost always caused by temperature shifts. When hot wax cools too quickly, or if it is exposed to sudden temperature changes during the curing process, the wax molecules crystallize rapidly, forming those visible white patches.

If you are pouring in a cold room, or if a sudden draft from a window or an air conditioning unit hits your cooling jars, frosting is highly likely to occur. This is incredibly common in places like Victoria, where the temperature can drop 15 degrees in a single afternoon!

3 Pro-Tips to Prevent Frosting

1. Preheat Your Glassware Pouring hot wax into a freezing cold glass jar is a recipe for instant crystallization. Before you pour, gently warm your jars. You can do this by hitting them briefly with a heat gun or placing them on the lowest setting in your oven for a few minutes.

2. Manage Your Pouring Environment Your workspace temperature matters just as much as your wax temperature. Try to pour your candles in a warm, draft-free room.

• Insulate the bottom: Don't let your hot jars sit directly on a cold granite or metal countertop. Place them on a wire cooling rack or a piece of thick cardboard so the bottom doesn't cool faster than the top.

• Space them out: Give your candles about an inch of breathing room between jars so they cool evenly.

3. Adjust Your Pour Temperature If you are consistently getting frosted tops, try lowering your pouring temperature by 2°C to 5°C. Pouring soy wax when it is slightly cooler (and looking a bit cloudy or slushy) often results in smoother tops and fewer crystalline structures.

How to Fix Frosting on Finished Candles

If the frosting is only on the surface of the candle, you can easily fix it! Simply take a craft heat gun, hold it a few inches away from the surface, and gently melt the top 2 millimetres of wax. Once it sets again, it should dry to a smooth, flawless finish.

If the frosting is heavily pronounced on the sides of the glass, the easiest fix is to utilize a beautiful, opaque wrap-around label, or switch to pouring in luxury tins where the sides are hidden.

Ready to perfect your pour? Check out our full range of professional candle waxes today at Australian Luxury Candle Supplies.