- Chalk
[http://en.wikipedia.org/wiki/Chalk]
- Wax
[http://en.wikipedia.org/wiki/Wax]
- Soap
[http://www.deancoleman.com/whatissoap.htm]
- Tar
aug 9 2007 ∞
aug 10 2007 +
aug 10 2007 +
[http://en.wikipedia.org/wiki/Chalk]
[http://en.wikipedia.org/wiki/Wax]
[http://www.deancoleman.com/whatissoap.htm]