 In response, some deny that the two a priori entailment claims are on a par (Alter 2018). Mary could come to know any structural truth while still in the room, the response runs, because any structural truth can be fully conveyed in the colorless language of objective science. But protophenomenal properties are non-structural. So, perhaps some protophenomenal truths cannot be fully conveyed in such colorless language. If so, then the Russellian panprotopsychist’s a priori entailment claim might not meet the same fate as the one associated with certain traditional physicalist theories.