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Sources:
http://www.google.com/patents/US7713375
https://www.google.com/patents/US20060287217
http://www.clarusglassboards.com/what-is-whiteboard-ghosting/
http://www.clarusglassboards.com/whats-in-a-dry-erase-marker/
http://www.expomarkers.com/faq
If you have an old, well-used whiteboard in your classroom, you might see something a little strange — ghosts! But not the spooky, bust-able kind… these are the ghosts of lectures past!