GSC x Mtn Trop To make our UltraPremo Rosin Lava, we gently heat our UltraPremo Live Rosin – which like all our rosin is first-press only – to promote THC crystal growth while preserving terps. We make this grade of lava from the 90-119 micron trichome heads, so this UltraPremo hash is super flavorful, oozy, and light in color. Lava is low maintenance – it doesn’t readily degrade and should be stored at room temp.