Wick testing is the most critical step in candle development. The wick determines how evenly your candle burns, how much fragrance is released (hot throw), and whether the candle is safe. A wick that's too small causes tunneling (wax left on the sides), while a wick that's too large can cause excessive flame height, soot, overheating, and even container breakage. Proper testing ensures a clean, safe, and satisfying burn experience.

Melt pool ratio is the diameter of the melted wax pool divided by the candle's container diameter. For most container candles, an ideal ratio is 0.65–0.90 (reaching full melt pool within 2–4 hours of burning). A ratio below 0.5 indicates the wick is too small (tunneling risk), while a ratio above 1.0 means wax is melting too quickly against the container walls, potentially causing overheating. Tracking this metric across tests helps you zero in on the perfect wick size.

The industry standard is to burn for 4-hour intervals, allowing the candle to fully cool between each session. Record observations at the 1-hour, 2-hour, and 4-hour marks to capture flame behavior over time. Shorter candles (under 3 inches diameter) may reach full melt pool in 2 hours. Always follow the "1 hour per inch of diameter" rule as a starting guideline for burn session length.

Key warning signs include: tunneling (wax remains on container sides), mushrooming (carbon buildup on the wick tip), excessive smoke or soot, a flame that flickers excessively or is too tall (over 1 inch), poor hot throw (weak fragrance), and a melt pool that never reaches the edges after multiple burns. Any of these indicate the wick type or size needs adjustment.

Professional candle makers typically conduct 3–5 complete test burns (through the entire candle) with each wick candidate. This reveals how the wick performs at different stages—top, middle, and bottom of the candle—since heat dynamics change as the candle burns down. Document every session using a log like this tool to spot patterns and make data-driven decisions.

Absolutely. Different waxes have different densities, melt points, and viscosities. Soy wax is thicker when melted and typically requires a larger or hotter-burning wick. Paraffin melts more easily and often works with smaller wicks. Coconut wax and beeswax each have unique burn characteristics. Always test wicks with your specific wax blend—a wick that works perfectly in soy may be overpowering in paraffin.