Hagoromo chalk: Why the demise of a Japanese company is a blow to mathematics, The Independent

The Hagoromo Fulltouch Chalk was known as the
The Hagoromo Fulltouch Chalk was known as the 'Rolls Royce' of chalk

Why Mathematicians Are Hoarding This Special Type Of Japanese Chalk

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What is the Japanese chalk that even told mathematicians that it is impossible to make a calculation error with this chalk? - GIGAZINE

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Why Mathematicians Are Hoarding This Special Type Of Japanese Chalk

Mathematicians mourn the loss of the 'Rolls-Royce of chalk

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What is the Japanese chalk that even told mathematicians that it is impossible to make a calculation error with this chalk? - GIGAZINE

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Drinking from the Firehose #121: ✊ Knock-on effects. ✊

How a brand of chalk achieved cult status among mathematicians

Incunabula on X: Hagoromo president Takayasu Watanabe: I developed the production facilities by trial and error. For creating the materials for chalk, we modified a machine for mixing flour. For molding the