Bubble hash is a cannabis concentrate comprising countless trichromes, or resinous glands, that have been separated from the plant using icewater, agitation, and a sieve. Bubble hash gets its name from the way that it bubbles when exposed to flame. The bags used to make it at home are also known as “bubble bags. ”The process of making bubble hash involves agitating cannabis plant material in ice-filled water. The resinous trichomes freeze and break off of the plant matter, sinking to the bottom of a metal sieve, usually within a series of mesh screens, each with a diminishing sized mesh. The finer the mesh, or “micron,” the finer the material and lesser the plant matter. Bubble hash comes in an array of colors, depending on the ripeness of the cannabis being used, the amount of plant material that makes it in, and the size of the mesh micron it was filtered or “sieved” through. Bubble hash can range from blond to red to black, with the lighter colors often being the most desirable.