You can melt any soap, just not in the microwave. You would probably have to grate and rebatch it in the way described in the video I posted. If if were impossible to melt milled soap, it would also be impossible to make triple milled soap. Needless to say, I mill/rebatch soaps all the time. Some people avoid rebatching by just grating and compressing the soap back together in the new container, no need to do that if you have the bowl though. To give you an idea of how much you can stretch a puck of Tabac, please read Utopian's posts on this thread:
http://straightrazorpalace.com/newbi...ay-lather.html
He make his last for 5 to 7 years. I would not go that far but it is possible.
Al raz.