Smoking to a fine white (gray) ash is possible as many have said. I experienced this zen moment this evening. I think the temp/humidity and smoker cadence are the biggest key factors as mentioned. I was relaxed on a bench outside The Blind Lemon in Cincinnati enjoying some Stanwell Melange in a pipe I made while relaxing and enjoying some live music inside. The weather was perfect; not too hot and not too cool with an ever-so-gentle breeze. No relights either. When it happens, it's kinda magical. Most often than not, though, I smoke too fast and hot and end up with at least some dottle. One thing I have noticed though- when I try to smoke to a fine white ash, I never can. When I'm relaxed and in the right state of mind and don't put much thought into it or when my mind is relaxed but wandering, it happens.