In reality, it is not really a color-changing pipe. Gold and silver is used to fume the glass. The fumed silver and gold is very thin. The black background allows the light to reflect and refract through the precious metals.
In reality, it is not really a color-changing pipe. Gold and silver is used to fume the glass. The fumed silver and gold is very thin. The black background allows the light to reflect and refract through the precious metals.