Quality
Tiny pieces of leaf matter may be accidentally or even purposefully added adulterants introduced when the hash is being produced will reduce the purity of the material. The tetrahydrocannabinol (THC) content of hashish comes in wide ranges from almost none to 70%, and that of hash oil from 30–90%.
Fresh hashish considered to be good quality is soft and pliable and becomes progressively harder and less potent over weeks and months as its THC content oxidizes to other cannabinoids and as essential oils evaporate. Hashish color usually reflects the methods of harvesting, manufacturing, and storage. Hash is generally said to be black (Afghanistan), brown or blonde (Morocco); there is also hashish of greenish or reddish (Lebanon) hue. A green tinge may indicate that the hashish contains a large amount of leaf material.
Another test of quality hashish, at least of the cold water screened hash and dry screened, is that the higher purity hash bubbles when it is heated and smoked. Hence the term 'bubble hash'. In water hash, the different micron screens separate different grades, and those of the highest purity 'bubble', even when dried, as soon as the flame or soldering iron come close
Ash after burning should be white and soft; hard, dark, cinder-like shapes may indicate impurities.
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