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  1. #11
    David A. Goldfarb's Avatar
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    Quote Originally Posted by argus View Post
    David,
    Since I don't have a densitometer, I can't give you any details, but my negatives usually print well on grade I 1/2 to II 1/2, sometimes even on grade I. I rarely have to use a grade 3. The negative in the example is a grade II
    That's probably not contrasty enough. For albumen, which is also a printing out process, I usually want a neg that is too contrasty for grade 2 Azo, and a neg that prints well on grade 2 Azo usually needs about grade 0 on MGFB. So you might try making a neg that's too contrasty for grade 0 with your favorite VC paper.

    David
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  2. #12

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    Second this -> a negative suitable for grade 2 s/g paper will definitely need a contrasting agent in the coating solution to print well with pop pd process.

    BTW, the negatives I prefer for POP Pd prints (w/o using a contrasting agent) have a density range around log 2.8 -> probably not printable even with grade 0 s/g paper!

    You can use Ammonium Dichromate in the coating solution. IIRC, 1 drop of 1.25% AD in 10 drops of combined AFO + LiPd coating solution will give you a sensitizer that requires negatives with a density range around log 1.8...

    Hope this helps,
    Loris.

    Quote Originally Posted by TheFlyingCamera View Post
    Sounds like you need contrasting agent. I've found that the best results I get with pt/pd printing are with negs that print around grade 1 on silver. I think you'll also be very pleased with the performance boost you'll get from COT320 - it will yield a naturally contrastier print, and it seems to print faster for me as well.

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