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

No ink. No ink dust. No disposable pens. High contrast. Apply as paint to any surface.