[aapeli]

I was first introduced to Hagoromo about four years ago when the word had just come out that they were closing shop. A colleague of mine was in love with it, and ordered several boxes. I managed to get two sticks of the stuff and used it sparingly for quite a long time. It really is way better than the majority of chalks. It's coated in a thin film so your hands don't get dirty and it's extremely fine making it smooth to write with.

The article is a little comical about the effects of using the chalk, but due to its scarcity, I've certainly heard that some use it only for the most important theorems.