I have talked to Matt Nelson about what qualifies for conservation, and what doesn't. For the most part color touch and large pieces added are the main task not allowed in a conservation label, so technically deacidification would fall under conservation. Unfortunately CGC's policy is to treat each book on a case by case bases, and so one book could end up conservation, while another with the same work can end up in restored label for any number of reasons at CGC's sole discretion. This is frustrating as only many trials and errors will provide some sort of consistent boundary on submitting with the sole goal of a conserved label.