How to store Goldwell cylinders?

Hi there! I've just upgraded to the Goldwell color cylinders from the tubes and am wondering how to store the cylinder after use, to make sure the color does not dry out. It must be possible, as the salons have the big cylinders and use and reuse them ... does the pressure automatically keep the color fresh? Should I put in a plastic baggie, or will it explode?

Thanks so much!

No need to do anything as they are self contained and do not allow air to get in. make sure they are kept in a cool place out of direct sunlight and thats it.

Terrific, thank you! :)

does any one have the color carts for the canisters for sale??????? I am very interested in buying 2 at least