Great info from Mike, as usual. Thanks for sharing this. Please note that my procedure contains a (pretty long timed) gold toning step BEFORE the alkali EDTA clearing bath, therefore the warning about bleaching becomes moot in my context, same for Pt or Pd toning... And I strongly suggest gold, pt or pd toning for any type of colloidal silver image (vandyke, kallitype, argyrotype, salted paper, ...) wherever longevity is a high priority concern. Regards, Loris.