Question: where are purified void salts?
Answer: The Purified Void Salts is a quest item found in The Elder Scrolls V: Dawnguard. It is a quest item for the quest "Chasing Echoes." It can be found in the old laboratory of Valerica. It lies in the large bowl next to the fire salts and normal void salts on a shelf on the top floor of the chamber.