Reduced Dmax with overexposure in Pt/Pd

[Sandy King <sanking@clemson.edu>]

With reference to the Pt/Pd results that I reported earlier today, 
there was an  anomaly that surprised. When making test prints with a 
step wedge I generally overexpose by 2-3 stops. What I noticed in 
looking at the curves, and this was true of curves with all of the 
lights tested, is that there is actually a rather significant 
decrease in Dmax, or maximum density, with overexposure. By 
significant I mean between log 0.05 - 0.10.

Is this something that one generally expects to encounter in platinum printing?


Sandy King


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