Good to know, thanks!

Hello everyone! I can't seem to find a thread concerning the use of color crystals -- and I've yet to play the game myself due to the fact that I'm currently away from home. I only have a few questions so I'll get to it! How do the Color Crystals that you received with the purchase of the CE work (I already know how & where to get it from), what colors are availible & is this item reusable after it's first use or does it simply disapear? Thanks!