Well, in the third world of cannabis (EU) this is common knowledge. Most harmless cutting agents are plant matter or honey for Moroc Hash. Henna is common in Afghan Hash. I may add that wherever in the world you are offered with "imported traditional hash", coming from Moroc or Asia, it's unlikely to get anything uncut, unless you are in the origin country or have a strong (and unlikely) connection. For example it is known that dutch coffeshops or affiliates own land in countries where cannabis grows out in the open, where first quality hash gets produced (along with low quality hashish, of course). Have a look in YT at Strainhunters documentaries by Greenhouse (seedbank and Coffeshop firm).
It is said in the docs that the guy with dreadlocks wearing black glasses all the time, watches over Greenhouse grows operations outside of Nederland (namely only for seed harvesting and "strain hunting" of course).
Same thing applies to organized crime, but they don't have to estabilish a brand or attract connoiseurs customers as some coffeshops do, so they are primarily focused on low grade, cut hashish.
This happens because cannabinoids in "traditionally cut hashish", come along with adulterants which only melt at higher temperatures than cannabis concentrates need. And if you don't heat enough the cutting agent(s) you don't vaporize the cannabinoids that aren't in the surface of the crumbles, and so, not directly exposed to the heat. That's why the more small the crumbles, the easiest it is to getting high off of such thing.
Lemme google it for you, lucky bastards with easy and legal access to full melt
"Pure, properly stored hashish of premium quality is soft and can be moulded by the heat of the fingers alone. Old, improperly stored hashish of poor quality is rock-hard and brittle, and has to be heated substantially before it is soft enough for use (although some hashish of considerable potency, usually Moroccan, may also be found in hard form). Most hashish falls in between these two extremes, and the tactile qualities also vary according to the methods used in extraction and pressing. There is also hashish of greenish or reddish hue.
A green tinge may indicate that the hashish is impure, which has been cut with low-quality leaf or contains high quantities of chlorophyll.
Low quality forms of hash often contain adulterants used as cutting agents added to exaggerate the value of hash through increasing the volume or including other cheaper drugs. Such forms usually possess a low potency and may have a strangeness in taste and feel. The
adulterants in the hash may range from waste material from the
Cannabis plant to products such as
soap, vaseline, beeswax, boot polish, licorice, henna, ground coffee, milk powder, pine resin, barbiturates, ketamine, aspirin, glues and dyes, as well as carcinogenic solvents such as toluene and benzene. The low quality may lead one to smoke more to get the same effect.
Because hashish, particularly in Northern Europe, is often adulterated, some people have started boiling their hash in water for a few minutes and then drying it before smoking. This is thought to remove all water-soluble
adulterants while the psychoactive cannabinols remain intact as the temperature isn't sufficient to destroy them and they aren't soluble in water."
You can find the above exerpt and more infos here:
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psychology.wikia.org
(or googling "hashish adulterants")