A weed pipe is made using two processes:Blowing and Fuming. Glass Blowing In this method, glass is blown into a huge bubble using an even, hexagonal arrangement of clear glass. The bubble is then collapsed back to its compact form. Glass produced using this method is referred honeycomb glass. Weed bowls have unique features compared to clay pipes that are mass-produced. An artisan designs these pipes, and they all have different levels of creativity. Most of these bowls are hand-blown while others are whirled on glass lathes. Patterns can be created on the pipes by blowing colored glass bubbles into larger fusions of clear glass. They can also be created by weaving heated strands of glass together. The layer of powdered glass is then melted and the entire procedure is repeated several times. This adds consecutive color layers to the glass. After annealing the end piece, elaborate patterns are engraved into the hand pipe using sandblasters. This reveals the underlying colors and the intensity of the colors depends on the etching depth. The resulting glass is referred to as Graal glass. Other times, the crushed-colored material is mixed with molten glass to suspend tiny color flecks in the end piece. This process is known as fritting. Fuming This is the process used to produce color-changing weed pipes. Silver, gold, cobalt, or other metal vapor are passed through the glass. As the material cools down, it traps small pieces of metal in it. The glass will be left with a very faint tint. When the pipe is being used, tars and resins begin to start forming a coat on the inside of the glass. This coating develops some type of dark background against which the trapped metal vividly shows. The process forms shimmery, dichroic coatings on the glass through the vapor-phase deposition of metal oxides or quartz. An electronic beam placed in a vacuum chamber is used to vaporize the materials. Small-charge is applied to the weed pipe. The charged pipe surface attracts the vapors which condense on it forming some type of drops similar to water drops. However, this condensate is crystalline and is extremely thin. In addition to the visible colors, the dichroic layers will also have unique reflective colors. The dazzling color is a result of color change when the weed pipe is observed at different angles or under varying lighting. Silver fuming will produce a slight yellow shade that changes to blue when the pipe is used. Gold fuming results in a slight pink shade that turns into gold when the pipe is in use. Getting other color changes from gold fuming is possible. Cobalt fuming will produce a deep blue tint.