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A comment on Mathematicians Are Hoarding a Type of Japanese Chalk. Parent comment

Re:Mathematicians Are Hoarding a Type of Japanese Chalk by benplumley on Tuesday June 16, 2015 @08:33AM (#9725247)
For a product that's disposable, I doubt any such system could justify its cost.
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Re:Mathematicians Are Hoarding a Type of Japanese Chalk by noir_lord on Tuesday June 16, 2015 @10:29AM (#9726026)
http://i.imgur.com/UDAZQUI.jpg

Depends on the cost to implement and the margin you can charge over competitors I guess.

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Re:Mathematicians Are Hoarding a Type of Japanese Chalk by Symbiote on Tuesday June 16, 2015 @11:01AM (#9726271)
The whiteboard pens we have at work have a semi-transparent barrel:

http://www.postofficeshop.co.uk/images/product/extraLarge/2/...

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