[420SX]

In the reflection of the flash you see tints of blue right? Those are the areas that were properly fumed with silver. The whiter area shows poor fuming of silver in that piece. It'll change colors without a doubt, but next time when you're in a headshop but the piece on the black cloth they have and you'll see the colors that it should change. Also, when you hold it up to the light, if you see yellow its silver fumed and will turn blue. If its pink, it'll turn green as resin cakes the inner walls of the pipe.