If you’ve attended one of my workshops, you’ll know that I talk a lot about consistency.
One of the most common frustrations candle makers experience is inconsistency — candles that tunnel, smoke, mushroom, or burn unevenly. These issues are rarely the result of bad luck. They are usually caused by an untested combination of wax, wick, and vessel. Understanding how these three elements work together is what separates hobby candle making from professional-quality production.
There Is No “Perfect” Wax
Different waxes behave differently depending on fragrance load, vessel size, ambient temperature, and wick choice. Even two soy waxes from different suppliers can perform very differently.
Soy wax is popular for its natural image and clean burn, but it still requires careful testing. It can frost and respond sensitively to fragrance oils and wick changes. Blended waxes can offer improved glass adhesion or smoother tops, but may require different pouring temperatures and curing times.
Wax should always be chosen based on performance in your specific design and not trends alone.
Wick Choice Matters More Than People Realise
If wax is the fuel, the wick is the engine.
The wick controls the melt pool, burn temperature, and overall safety of the candle. Too small, and the candle tunnels. Too large, and it may burn too hot, smoke, mushroom excessively, or consume wax too quickly.
Cotton and wooden wicks behave differently and respond to fragrance load and vessel diameter in unique ways. Even increasing fragrance by 1–2% can require a wick adjustment.
Wick selection should always be guided by structured testing rather than assumption.
Vessel Size and Shape Affect Burn Performance
The vessel plays an active role in how your candle performs.
Wider vessels require different wicks than narrow ones. Thick glass retains heat differently from thin glass. Even small changes in diameter can significantly affect surface area and melt pool formation.
Whenever you change vessels, testing should be repeated, even if the wax and fragrance remain the same.
Why Testing Saves Time and Money
Testing may feel slow, but it prevents wasted stock, customer complaints, and reputational damage.
Recording results helps you spot patterns and make informed decisions rather than guessing. Professional candle makers view testing as part of production, not an optional extra.
My Approach to Testing
In my own business, consistency is essential. My testing process focuses on changing one variable at a time, keeping clear records, completing full burn cycles, and testing under realistic usage conditions. This structured approach reduces confusion and leads to more consistent, confident results.
If you would like more structured guidance, I run a monthly candle testing masterclass via Zoom and offer a detailed testing and formulation guide to help candle makers refine their products with confidence.
