Saturday, 14 January 2012

PMK Pyro after bath.

I have been developing Ilford FP4+ 120 format in PMK Pyro for ten minutes for quite some time, without an afterbath. With my latest use of this developer I decided to change part of the process, instead of inverting the tank every twenty seconds I changed it to every fifteen seconds to see if this increased the density of the negatives. My reasoning is that previous negatives have looked a bit on the thin side. Yes you are right! I could have increased the developing time but wanted to find out how much influence agitation has on the process.

FG 1
Film FP4+
When changing or adapting a method that works well, it is better to change one aspect of it at a time so that it makes it easier to judge whether it is an improvement or not. So what did I do introduce a re-bath of the film in the developer after the fix. The after bath is part of the full process when using PMK pyro that completes the staining. Up to now I have not felt the need to do this but was curious to see how much stain would be added and if it improves the print quality. I did this for the two minutes suggested which I agitated for thirty-seconds at the beginning and ten seconds one minute later.

FG 2
Film FP4+
There has been a marked difference in the density and the colour of the staining on the negatives. The picture marked Fg 1 shows the negatives developed with the afterbath, they have a yellow-brown look to them. Fg 2 shows negatives without the bath and they have a purplish look to them.

These results would suggest that an increase in agitation has just as much effect if not more on the density of the negative than an increase in the process time. The afterbath also produces a significant change in how much stain is deposited which is supposed to help in making these negatives easier to print. I have found that even without the extra staining I have been producing some wonderfully toned photographs. I have not printed this latest set of negatives yet but hope to do so soon.

Related Posts:

FP4+ PMK pyro method update.
PMK Pyro developer part B
PMK Pyro working solution