Are you talking about color changing glass? Well with that, the glass really doesn't change color, it just looks like it because the resin from smoking will darken the glass and the metal that is layered between the glass will be more visible. So if you are talking about color changing glass, you will have to smoke to get the illusion of a color change.
sawleaf Reviewed by sawleaf on . Glass Pipe Question What is the fastest way to make the color spread on a glass pipe. I prepfer not to smoke out of it, I wanna keep it as legal decoration. :D Rating: 5