Ilford HP5+ @400
left side: Pyrocat-HD 1+1+100, 16min
right side: 510-Pyro 1+100, 6.5min
left side: Pyrocat-HD 1+1+100, 16min
right side: 510-Pyro 1+100, 6.5min
make a big enlargement (10x at least) and scan it - THEN we can talk about "comparison".
Thank you for those words. A scanner doesn't see what a silver gelatin paper sees.
Especially split grade printing and stained negatives.
No real difference between silver gelatin and pt/pd? I am... surprised. You probably know something I don't know regarding that, so I will not open my piehole too wide.
But when I split grade pyro negatives on silver gelatin paper, I see things happening in the highlights that I don't see with for example Xtol or Rodinal. It seems as though the color of the stain in combination with the Grade 5 Ilford filter have a relationship that doesn't exist were it not for the image stain.
Also, to resolve grain you need something like 4,800dpi full optical resolution. There are very few scanners that can manage that, which makes the comparison above a bit redundant, because you don't see exactly what happens in the grain department. You see an approximation and grain aliasing.
Not that grain is that interesting anyway...
The effect would be stronger with a typical greenish Pyro stain than with the more subtle, brownish Catechol stain. But essentially what you get with Pyro and VC paper is a variable low contrast filter built into the negative, which results in highlight compression (which is why many people find it easier to print highlights with stained negatives/VC paper). If you expose the stained negative with say a 2 or 2.5 filter for example (or white light), since the stain proportionate to silver density, you effectively have added a filter which lowers contrast in areas of high density.
I've never used Pyrocat HD though so I wonder how pronounced the effect is compared to a stronger greenish stain (eg PMK).
But when I split grade pyro negatives on silver gelatin paper, I see things happening in the highlights that I don't see with for example Xtol or Rodinal. It seems as though the color of the stain in combination with the Grade 5 Ilford filter have a relationship that doesn't exist were it not for the image stain.
VC filters of #3.5 or higher [...] in effect eliminate the compensating effect in high contrast scenes because the magenta filtration blocks light to the low contrast green sensitive part of the emulsion.
The 510-Pyro seems to have the edge in sharpness and slightly finer grain on my screen over the Pyrocat.Ilford HP5+ @400
left side: Pyrocat-HD 1+1+100, 16min
right side: 510-Pyro 1+100, 6.5min
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