I let the 34 burn for over over 7 hrs to see if it would eventually reach the edges, it didn't, and the 29 x2 wick I burn 4 hrs at a time, no popping st all the flames are still and calm, I can touch and move the jar below the wax line. Above it gets hot. I am shocked after all my testing these wicks didn't leave soot. I'll post a picture of the jar