http://en.wikipedia.org/wiki/Hashish 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.
the best hash is the blond hash. its basically the first " shake". the more you process the material the more green matter your gonna get, in turn making it a darker color. not that the darker isn't good, it just has more leaf matter or they have added something to it.
