Hi Jim,
I did see the print at AIPAD and I am quite surprised to hear the figure... I mean I am stunned, to be honest.
I am pretty sure that there is a mistake in the description. That was a silver print from collodion negative, as I recall. I mean I did not see the description at the show, but they were not different from any other silver prints from a collodion negatives that I have seen.
Apparently, enlargement from collodion negatives hold very well, you do not see grains so much. Maybe someone can explain better than I can.
Warmly,
Tsuyoshi