I successfully created a linearized curve using the PiezoDN-Master.quad from my printed 129-Spyder Step. I process printed the Step using the chemicals as described in the Data Sheet for the Epson 1430 (100%Pd + P.O. Developer). I was looking for prints with a bit more contrast, so I then printed my DN image with A.C. Developer but the result wasn’t much different.
In 2016 when using Jon’s older curves (51b-Lin-1_89.quad) with 50-50 Pt-Pd + A.C. developer, I was getting the exact look I wanted with a 5:00 minute exposure time.
So, the other day I took my 129 Step DN that I printed with the master.quad curve and process printed it with a bit less Pt than before - this time 70% Pd/30%Pt - and exposed it for my standard 5 minutes and used A.C. developer. The purpose of this was to create a linearized curve specific to my chemicals. But the 129 step was severely underexposed - only about half the squares were visible.
Q>Why would this print time, with me using similar chemicals as before, give me such an underexposed print? Is the 129step DN printed with the Master.quad causing this?
This time I even used a higher percentage of Pd than before, so one would assume I would get an even darker print with the same standard print time. Oh yes, I also printed a test strip to verify my print time, and the 5 minutes still looks about right.