Why is my soy candle leaving wax on the sides of the container as it burns? (part 5)

This occurs when the candle is extinguished before reaching a full melt pool and is referred to as “Tunneling”.  A candle should be burned 1 hour for each inch of the jar diameter.  For example, a jar with a diameter of 2 ½” inches should be burned for at least two and a half hours each time it is burned.  Keep candles clear of drafts and vents. All candles are prone to tunneling if put in this type of condition because the edge of the wax is not heated enough to melt.