The official GemStone IV encyclopedia.
An inky black potion is used to prepare both enhancive and sanctified gear for ensorcelling. A pour will last 10 minutes before wearing off. As of July 2018, potions are no longer required for difficulty testing. Sorcerers can make this recipe in the potions discipline; it is taught at rank 56.
Purchasers should buy these potions from a reputable alchemist. At one point an identical looking potion was sold off-the-shelf at a merchant event that has nothing to do with ensorcell.