Alastair,

Thank you for all the work you have done on this. I have some of the older papers only because a guy here had a bunch frozen and sold it to me cheap. I have found with some of it, but not all of it, if I add a small amount of Potassium Iodide (KI) to the developer, the 'slower' paper from age prints just fine. I have not tested all of them with toning but will be working on that. I really appreciate what you have come up with.