M_D is referring to a stripper comprised of a solution of phosphoric and chromic acids. It is used heated to boiling (its much less effective at lower temperatures) which makes it far worse. Toxic, very noxious, and highly corrosive to organics (like you). You don't want to go here, truly a case of "the cure being worse than the disease".
Jtsuttle is quite correct about some surface aluminum being converted to it's oxides during the anodization reaction.
|