What is Full Spec Rosin?: In contrast to 90u which only contains the first collection, Full Spectrum contains all of the collections. This results in a higher THC potency. Combination of all remaining trichomes to form a concentrate with a higher potency resulting in a more cerebral experience. Full spectrum Rosin starts out by combining the first pull of 45u-90u plus two more pulls of 45u-149u trichome heads, and mixing them all together.