Color Change Effect (CCG)

How does it work? There are many techniques and methods but the basic is in holding the small pieces of metal in the flame. The glass is rotated in this vapor stream until a fine layer of the vaporized metal is visible on the surface of the glass. After this, clear glass is applied to 'encase' the vaporized metal in between layers of glass. You mostly value pipes like that if they are translucent because when you use them often they get darker and you have impression that they change the colour...but not really, it only the colour look much more conspicuous because of the dark behinds.