You said:
> If you used a 21 step wedge with a
>density range of 3.05 (.15 per step) then your formulas need negatives with
>a 1.35 and 1.50 density range respectivly.
>
>Terry, am I misreading your results?
I was using 2 drops of ferric oxalate solution and two drops of palladium per
step wedge applied with a glass rod to ensure that was no carry over.. The
exposure was purely arbitrary. A longer exposure would have given more steps and
implied a negative with a longer range.
In fact, in tests over the past few days, I have obtained platinum / palladium
prints from negatives varying by over five stops in density with no addtional
chemicals for contrast controls.
( I was just checking to see if I could ' put my money where my mouth was', if
you will excuse the vernacular.)
Terry