4 ms·Why Mathematicians Are Hoarding This Special Type of Japanese Chalk (2015)1 points by susam 3y agoCraigRo 3y agoThere's no shortage now. A Korean company now makes it, and it is still great. But if you can't find any, I have a stick on my deskel_sinchi 3y agoGot a box now. They're good but nowhere the hype, I've seen brands costing a tenth writing almost as good