When HN users recommended it
1 HN user recommended this in 2014, in one comment.
20072026
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
Crayola Non toxic Anti Dust Chalkboards 50 1402
Amazon's catalog no longer lists this product (checked 2026-11-02). The name comes from the link HN users posted.
I have no hard data on this, but dry-erase markers seem to be used up more quickly than chalk.
Chalk is also less expensive. As one data point: 48 sticks of chalk for $4.30[1] versus 12 markers for $7.74[2]. I'm not sure about the bulk-price comparison, or if colleges can get dry-erase markers for cheap. Although, many of my professors carried their own supplies as markers left in rooms were usually stolen.
There could be a health comparison to be made between dry-erase marker fumes and chalk dust, but I know nothing about it off-hand.
[1]: http://www.amazon.com/Crayola-Non-toxic-Anti-Dust-Chalkboard... [2]: http://www.amazon.com/Expo-Chisel-Erase-Markers-80001/dp/B00...