Nice, when I did mine I took your advice and boiled it in a 40 gallon barrel, there was still enough carbon left over to put lead in a decent size pencil. Anyway, now the fun starts.
The best way I've found of getting the carbon from under my nails is doing the washing up.
We run a small B&B / ski chalet, if we have a full house over the weekend it's a full roast dinner on Sunday night. Doing all the pots and pans that won't fit in the dishwasher sorts out my cuticles a treat!
A Chalet bitches work is never done............
Cheers