Hash, or hashish, is a concentrated form of cannabis made by separating the trichomes (resin glands containing cannabinoids and terpenes) from the plant material. There are several methods for making hash, but some of the most common include dry sifting, ice water extraction, and solvent-based extraction.
Dry sifting, also known as dry sieve, is a mechanical method that involves sifting dried cannabis through a mesh screen to separate the trichomes from the plant material. The collected trichomes, also known as kief, can be pressed and heated to form a solid block of hash.
Ice water extraction, also known as bubble hash, is a method that involves agitating cannabis in a mixture of ice and water to separate the trichomes from the plant material. The trichomes are then collected and pressed to form a solid block of hash.
Hash making process is highly dependent on the quality of raw material, the method used and the experience of the operator.