Chalk

Chalk is great for writing on chalk boards, but there are some downsides. Here are some ideas to improve chalk and it's uses. 
==Self Erasing Chalk==
Chalk that will slowly fade, due to a chemical reaction, within a certain amount of time will save erasing the board.
==Non Powder Chalk==
Chalk that does not create chalk dust will help with coughing from chalk dust.
Category:Ideas