Chalk is still one of the primary tools of mathematicians (2015)

Nobody, perhaps, was as sad to see the company go as mathematicians who had become obsessed with Hagoromo Fulltouch Chalk, the so-called “Rolls Royce of chalk.” He recently appeared on a Japanese TV special about the demise of Hagoromo Bungu Co., where a TV crew came out to Stanford to interview mathematicians about the legendary chalk. Here you can see a long discussion online where mathematicians are hunting for Hagoromo chalk suppliers in the U.S. Satyan Devadoss, a Williams College math professor, even wrote a blog post calling it “dream chalk.”

Source: gizmodo.com