Quote Originally Posted by TrojanMan

Abou them changing, the glass has faint colors in it and when the inside get caked with dark resin it brings those colors out.

The reason some glass pipes change color is because the artist fumes precious metals to the interior of the glass before throwing it in the kiln. Different metals make different colors, and combinations of gold and silver can make colors ranging form white to blue to orange to green and everything in between. The colors show up as the inside of your pipe gets coated with resin. Boiling your pipes or cleaning them however will remove the color, but should not affect its color changing properties unless you use an exceptionally abrasive cleaning technique.

That is why glass pipes can be so expensive, there can often be 6-10 hours of work in a 5 inch spoon. But you can tell quality pieces from junk by the amount of work on the pipe (inside-out work, creative colors, exterior canwork, etc.) and the weight of the glass (heavier means more glass means harder to break). To check if your pipe will change color, place it against any black background (e.g. the sleeve of a black hoodie ) you will get an idea of the colors that will come with time. Any head shop worth its two cents will have a piece of black cloth, often a velvet pad, to inspect pieces on.

Btw, nice piece, just keep an eye on that skinny part in the neck, it'll clog on ya