At that point Luis suggested that I investigate the archivalness of the
process as he thought that it would not survive extended exposure to UV.
So, per Luis, I took a brightened print, cut a bit off and taped it to a
window for a couple of months. Sure enough, as Luis expected, the paper
exposed to direct sunlight every day has reverted to it's orignal
non-brightened state. The backside of the paper, only exposed to bright
ambient light every day survived.
dave