I'm not asking about the proper way to break in a pipe or build up cake in the bowl: I always just load to the top and smoke to the bottom, but I read something the other day that got me curious. I read on a website somewhere that a suggestion for building up good cake in a bowl was to take the ashes that were left in the bottom of the bowl, sort of stir them up a little, put you hand over the bowl and give the bowl a shake, coating the inside of the bowl with the ashes. I have been trying this with a new pipe that I am breaking in and I can't seem to tell whether or not it is helping. So I guess the question is: Do the ashes in the bowl help the cake form better, or is it the actual physical act of tobacco ignition what causes the carbon buildup in the bowl?