"The legend around this chalk is that it's impossible to write a false theorem using the chalk, but I think I've disproved that many times," says David Eisenbud, a mathematics professor at the University of California at Berkeley.
Why the World’s Best Mathematicians Are Hoarding Chalk
A Korean teacher rescued Hagoromo's legacy from disappearing
Shin Hyeong-seok, a teacher in Korea, took over the manufacturing of the Hagoromo Fulltouch Chalk when Takayasu Watanabe, the president of Hagoromo Stationery of Japan, was diagnosed with cancer. Shin literally saved the brand name and the secret chalk manufacturing process from disappearing, with Watanabe's full blessings.
No More Dusty Hands
Hagoromo Fulltouch Chalk is produced with a specialized coating that prevents it from disintegrating in your hand while writing, even if you have sweaty palms. The coating also makes it resist breaking into a million pieces if it falls from height.