Sustainable white board

BuddhaBoard=====http://sageecostore.com/product/650/buddha-board.html======

The goal of project is to develop sustainable alternatives to white boards for use in educational and commercial settings. The inspiration is the Buddha Board (http://www.buddhaboard.com/), a water based marking system with high contrast that erases through evaporation. According to the manufacturer, that technology is not robust enough for a white board replacement. What might be?

Inspiration

Buddha board images https://www.google.com/search?q=buddha+board&client=firefox-a&hs=SG8&rls=org.mozilla:en-US:official&source=lnms&tbm=isch&sa=X&ei=M-1rUuXUD-r72QX7roDYAg&ved=0CAkQ_AUoAQ&biw=1147&bih=581

Advantages

People like water. No ink. No ink dust. No disposable pens. High contrast. Apply substrate as paint to any surface.

Market

http://www.edweek.org/dd/articles/2012/02/08/02whiteboard.h05.html

Number of students in the US is of order 80 million. Take 20 students and a few white/black boards per class.

Questions

Material should be safe and sustainable. Auto erase should be controllable. Use long evaporative time constant then heat or hair dryer for wipe for quick erase?

-Carlsmith