Liquid Chalk Remover for Blackboards?

Question

I have a set of Zig Posterman Liquid Chalk pens, waterbased pigment ink, for an office blackboard. They are supposed to be water soluble, removable with common household cleaner (Windex). This doesn't seem to be the case and I'm wondering what they use for a cleaner at Starbucks since they use liquid chalk markers on their boards. I'm also wondering if a solution with ammonia might do the trick or if it may be that my board is too porous. Any advice would be appreciated.

Answer 1

A bit of simple chemistry may be in order. As chalk is a carbonate mineral an acid would be the best way of removing it and the most natural method may be to take a bottle of rain water,which is slightly acidic,and gently sponge a little onto the offending graffiti. Our local tap water would not be effective as it comes from the chalk aquifers and is too hard.Pavement artists seldom see their work survive a shower.

Try your natural acid first. Lemons, vinager, citric acid would appear to be your best option.

If that doesn't work you can go to your local home improvement warehouse and purchase some graffiti remover. http://www.graffitiremover.com/
Good luck.

Answer 2

Waterproof Chalk Pens

Answer 3

I really don't know exactly but you can check this site maybe you can get some info about it..☺

http://www.freepatentsonline.com/3949132.html