I decided to add Ammonium Citrate (AC) as an optional developer for my Pd. workflow. I normally use Potassium Oxalate (KOx).
I first determined the minimum exposure time to obtain max density using the 4x5 Stouffer 21 step chart. FYI AC is a little over 1/2 stop slower than KOx in my workflow. Both developers are used a studio temp. (between 64 and 66 year round); at this time of year RH is 40%-44%. Paper is Revere Platinum.
Knowing my max. density minimum exposure amount I printed the Spyder 129 step chart using my master linearized curve for Revere Platinum paper, 100% Pd., and KOx developer. For reference I have enclosed it.
The first thing I noticed on the print after dry down were extremely bright patches in nearly all the first row. After measuring all 129 steps I determined that the first four or five patches are paper white. I have enclosed this .txt file. I have also enclosed a smoothed version (QTR Data Tool, smoothing = 2. Ffile name appended with S=2).
Here are a set of questions:
Can I use this data set to linearize for AC developer?
If the answer to #1 is no should I print LIMITER.tif and proceed with that workflow OR should I print a new 129 Spyder target using the Pro-PiezoDN-Master.quad? Or some other .quad?