'''Hagoromo Bungu''' ({{lang-ja|[[:ja:羽衣文具|羽衣文具]]|Hagoromo Stationery}}) var et japansk selskab der producerede og solgte [[kridt]] og kontorartikler. Firmaet var bedst kendt for at have produceret '''Hagoromo Fulltouch Chalk''', der var et mærke af [[tavlekridt]].<ref name=":0">{{Cite web|url=https://blogs.wsj.com/japanrealtime/2014/11/20/chalk-maker-runs-out-of-blackboard-in-japan/|title=Chalk Maker Runs Out of Blackboard|last=Hongo|first=Jun|date=2014-11-20|website=WSJ|language=en-US|access-date=2019-05-05}}</ref><ref name=":3">{{Cite web|url=https://gizmodo.com/why-mathematicians-are-hoarding-this-special-type-of-ja-1711008881|title=Why Mathematicians Are Hoarding This Special Type of Japanese Chalk|last=Zhang|first=Sarah|website=Gizmodo|language=en-US|access-date=2019-05-05}}</ref><ref name=":4">{{Cite web|url=http://www.independent.co.uk/life-style/gadgets-and-tech/news/hagoromo-chalk-why-the-demise-of-a-japanese-company-is-a-blow-to-mathematics-10326313.html|title=Why the demise of a Japanese chalk company is a blow to mathematics|date=2015-06-17|website=The Independent|language=en|access-date=2019-05-05}}</ref> Hagoromo-varemærket og en stor del af firmaets oprindelige udstyr blev solgt til det sydkoreanske firma Sejongmall, der igangsatte produktion i [[Sydkorea]] i 2016.<ref name="korea">{{Cite web |url=https://alumni.berkeley.edu/california-magazine/just-in/2019-06-14/chalk-market-where-mathematicians-go-get-good-stuff |title=Arkiveret kopi |access-date= 9. januar 2020 |archive-date=30. juli 2019 |archive-url=https://web.archive.org/web/20190730054321/https://alumni.berkeley.edu/california-magazine/just-in/2019-06-14/chalk-market-where-mathematicians-go-get-good-stuff |url-status=dead }}</ref><ref>{{Cite web |url=http://www.kompass.kr/img/catalogue/20180719094839_1.pdf |title=Arkiveret kopi |access-date= 9. januar 2020 |archive-date=21. juni 2019 |archive-url=https://web.archive.org/web/20190621005224/http://www.kompass.kr/img/catalogue/20180719094839_1.pdf |url-status=dead }}</ref>
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