Want to burn your candle in the most optimal way that reduces the chance of soot and prolongs the life of the candle? Make sure you trim your wick 1/8-1/4" before EVERY burn. During the burning process it created carbon build up, which is normal, but not trimming the wick can cause soot and excess heat.
Allow for the candle to create a full melt pool, which happens when the wax melts from edge to edge. This can take 2-3 hours. Blowing the candle out before this happens can cause tunneling and cause the candle to perform at a lower quality.