Don't you think it could be Deacidified once print made just to bring it to neutral state for long time conservation.
I think thats got to be the most likely explanation Philippe. Purhaps he was using one of the modern chelating agents such disodium and tetrasodium Edta as a clearing bath to bring print to a more neutral state and was making note of this on the back to give museum's and conservators etc.. this additional information. I would imagine after three successive coatings and exposure cycles the print would have been in a heavily acidic state and would require quite lengthy deacification. I know from my own research that multi-layered platinum/palladium prints can take significantly more time to clear compleatly when compared to those of a single layer.
Last edited by Davec101; 03-03-2012 at 02:58 AM. Click to view previous post history.