There are some really informative articles in Graywolfs lair. In the info about extracts, links to hand rubbed, bubble and a load of info on dry sift and increasing quality by specfic screen size, best size of trichomes, electrostatic separation, warnings not to overwork, all sorts of good info.If you use dry ice it is kief. If you use ice it is bubble hash. Done right there is no plant material.
Bubba