Hash, or hashish, is one of the oldest forms of cannabis concentrate. It is made by collecting the trichomes, the resin glands on the flower, and pressing or packing them together. People have been making hash for centuries.
There are a few main methods. Hand-rubbed hash collects resin from the hands of people handling live plants. Dry sift passes dried flower over fine screens so the trichomes fall through, producing kief that can be pressed. Ice-water hash, also called bubble hash, washes plants in ice water so the cold, brittle trichomes snap off, then filters them through mesh bags of different sizes.
Bubble hash quality is sometimes rated on a star scale, with "full melt" hash being so pure it melts almost completely when heated. Higher grades are often pressed into rosin.
Hash can be smoked on its own, crumbled into a joint or bowl, or vaporized. Its strength varies widely, from moderately stronger than flower to very potent, so read the label and start with a small amount.
Hash is solventless when made with water, ice or sifting. Check the COA for potency and contaminant screening, and store it cool and sealed.