GH&Co tobaccos, the flakes in particular, produce a fine gray ash
Both "Gawith" brands of tobacco burn down to fine grey ash. I think it has a lot to do with overall quality of their tobaccos they use as well as their insane attention to detail and quality control.
Many Virginia's seem to burn down in a lighter grey consistency, while many English blends seem to make lumpier dark ash.
F&T Vintage Flake burns down to a fine white ash that is very light and powdery. So light and powdery that I have to be careful of laughing while smoking it, as it ends up all over me.

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