A friend of mine treated me today with 99% chocolate. I am a great lover of dark chocolate, but 99% turn my world upside down. It is much bitter, you cannot consume in great quantities, but then you should not. You should enjoy the taste of every tiny bit melting slowly in your mouth.
I am now hunting for it online, so far I have found this:
Michel Cluizel Noir Infini, 99% dark chocolate bar
Update, Lindt 99% is probably the sweetest pure chocolate I have ever enjoyed:
Lindt 99%, Excellence Dark Chocolate
Short link: http://thatis.me/~HWsS$2E
Michel Cluizel used to produce 100% dark chocolate, but now Noir Infini is the best they offer.