Re: Marble Coals
First post here, and though this seems like a neat and plausible idea, the reason coals are used is because as we inhale, air causes the coals to heat up, which in turn heats the shisha and so forth.
While using a stone of some sort though, this doesn't take place. I would think that you may get a decent length of time with a stone in place of a coal, you wouldn't have as enjoyable as an experience because the stone will not get hotter as you inhale.
I remember a while back someone was using an electric coil placed in what seemed to be a wind cover without holes (a cup) and was wired to heat up as a vacuum was created within it.
For all the trouble though, I'd just rather spend the 3 minutes heating up some natural coals and enjoying my smoke session! =)