Kalbo- you can try it. I use it every day and love it, I'm sure what he's referring to is an alum block. There are many sources for it, I get mine from Mama Bear's Soaps. It's about 8 bucks plus shipping....ahe gets her orders out very quickly and makes INCREDIBLE shaving soaps. A number of online barber supplies also sell it. It comes in two forms that Iknow of - one that is just a lump of the mineral, looks like a quartz rock. The other option, and what Mama carries, is milled down tothe shape of a bar of soap.
After a shveand rinse you moisten the bar and wipe it across your skin - careful around eyes and mouth. You can feel your skin tighten and yes it does give you a bit of a tingle. Soem guys leave it on the skin, others let it sit a minute or so andthen rinse. It's part of my daily routine and I really like it. I bought my first bar about 10 months back and just replaced it this week...probably had another month's use leftbut I dropped it and it split intoseveral small pieces so it was time.