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[[File:American medical hashish(3).jpg|thumb|180px|right|[[Trichome]]s isolated with ice-water extraction method.]]

'''Ice-water separation''' (also known as iceolator hash, water hash, or bubble hash) is an extraction technique for separating the [[tetrahydrocannabinol]]-laden trichomes from within [[cannabis]] in order to extract the [[resin]]. It is based on the principle that the resin glands of the cannabis plant are more dense than water. Iceolator tends to have a very high [[THC]] content compared to traditional methods of making [[hash]].


Trichomes may break away from supporting stalks and leaves when plant material becomes brittle at low temperatures. After plant material has been agitated in an icy slush, separated trichomes are often dense enough to sink to the bottom of the ice-water mixture following agitation, while lighter pieces of leaves and stems tend to float.


The ice-water method requires ice, water, agitation, filtration bags with variously-sized screens and plant material. With the ice-water extraction method the resin becomes hard and brittle and can easily be separated. This allows large quantities of pure resins to be extracted in a very clean process without the use of solvents, making for a more purified [[hashish]].