<p>People have answered your question already, but what about an erasable pen?</p>
<p>I have had good luck with these [Amazon.com:</a> Pilot FriXion Ball Fine Point, Black Erasable Gel Ink Pens, Dozen Box, 31550: Office Products](<a href=“http://www.amazon.com/dp/B001GAOTLY?tag=dvdmaailm]Amazon.com:”>http://www.amazon.com/dp/B001GAOTLY?tag=dvdmaailm) . Staples has them for about $5 for 3…</p>