I've never come across foreign hash, but here is my experience, from least potent to most potent:
Cold water/Ice extracted hash made using bubble bags (excluding kief, which is tumbled or screen-collected)
- Regular (cold water) hash that just burns, no melting, and leaves ash
- Half-melt (cold water) hash that bubbles and melts just a bit, but leaves ash
- Kief - ranges from greenish kief (weak, lots of plant matter), to super-amber/golden kief, which is quite potent.
- Full-melt (cold water) hash that fully melts and bubbles, leaves very minimal ash
- Full-melt clear dome, aka FMCD (cold water) hash that is the best kind of cold water hash, fully melts while making big bubbles (domes) that are, as the name suggests, clear in color
Solvent-extracted Hash Oil
-Isopropyl Alcohol Hash Oil - can be decent, but I would never smoke this, only use it for edibles
- Butane Hash Oil - includes shatter (bomb-ass, amber-colored oil), which could be whipped in to "wax," which adds air weight and makes it oxidize faster by making it unstable, but it is easier to work with your fingers. I would stay the hell away from any greenish or black BHO/wax, and unproperly purged oil and wax. A whole eighth of top-shelf, medical weed goes in to making a single gram of bomb BHO