Harder types of resin - mostly from Morocco and Lebanon are made by sifting mature cannabis flowers through a series of sieves until only a resinous powder remains. This powder is compressed and heated to allow the resins to melt and stick together forming blocks. The resin is then compressed into blocks and sealed with cellophane or cloth. The result is a hard, brittle hash, usually light yellow to brown and sometimes even reddish brown. Generally, the really hard and yellow stuff which is cerebral is old Lebanese on the whole, and the slightly darker brown hash is usually Moroccan. Apparently, new Lebanese is often also malleable.
The method used in Southern Asia involves rubbing the living flowers of the cannabis plants with hands, a leather apron or other implements. The aim is to get the soft and sticky resins to stick to a surface which can be taken somewhere to be processed and collated. These are then scraped off the skin or leather and rolled into lumps of various sizes and compressed into blocks. The color is usually dark-brown to black on the surface and lighter on the interior - air contact makes this hash go darker in color. The consistency is normally soft and a lump can usually be moulded into various shapes or sausages.
Usually, the potency of seized hash varies from under 1% THC to 26% THC. Typically the strength is 3% to 8% THC, with the rest being vegetable matter. Remember that THC is not the only drug in cannabis - there are various others such as CBD and CBN which all add to the effect.
Cultivation: Hash-Oil can be (and is) produced from any kind of Hash, so the cultivation method varies with the origin country.
Production: Hash-Oil is very simple to make: the dried and powdered Buds are soaked in a (preferably Non-Polar) solvent for a couple of weeks, then the solvent is evaporated and what remains is Hash oil.
Color: Extremely dark green to nearly black.
Smell: Highly aromatic and spicy.
Taste: Highly aromatic and spicy, taste however varies considerably with the source material.
Consistency: Hash-Oil (even a highly pure one) is quite thick and hard at room temperature. At body temperature it becomes extremely sticky, when heated it becomes a liquid.
Effect: Very physical and stony high. Most stony and physical high you can find.
Potency: Potent to very potent.
Availability: Quite rare but becomes available from time to time, probably a lot is produced in someone's kitchen.
Various: Nearly always some form of Alcohol is used as solvent. While this works quite well (especially if the source material is already good) there is a lot of Chlorophyll and other inactive substances in the product.
A purer form of Hash-Oil, usually called Honey-Oil, is produced by extracting the material with Petroleum-Ether (or some other non-polar solvent) and separating the water soluble substances from the insolubles. Unfortunately in the origin country usually low quality Dope is used in the production of Oil.
It is also quite easy to be ripped off when buying oil since it's very easy to adulterate.
Cultivation: No information available.
Production: Kashmir is the only Moslim country where Hashish is produced by hand like in Nepal and Afghanistan. Usually the producers in Kashmir aren't able to press the slabs decently.
Color: Black on the outside, brown-greenish inside. White lines usually present.
Smell: Very spicy and aromatic.
Taste: Quite an acquired taste, however not harsh on the throat.
Consistency: Somewhat harder than Afghani with less resin content. Natural oils are often added to render the Hash soft.
Effect: Physical and stony high.
Potency: Potent to very potent. (10-12% THC)
Availability: Very rare.