P-Cat in Weaker Dilutions for Warm Water

[gbenaim]

Hi all,

I was wondering how P-Cat HD behaves in dilutions weaker than my usual 1:100 as my tap water in the summer is 80 deg, and I'm getting uneven development in trays, which hasn't happened in the past. Can you use it at 1:200, with 80 degree water? I've been cooling the water down w ice, but it warms up eventually. Thanks,

GB

 

[Ian Grant]

Just adjust the development time, and rather than cool to 68°F/20°C if you process at 75°F/24°C then any drift in temperature will be less problematic.

I have a similar water problem, so in the middle of the summer use 24°C. At 24° the tines are approx 75% of the 20°C figure.

Ian

 

[juan]

I develop at 80F for about 9-months out of the year. I use 1:1:100 for standard development or 1:1:150 for extreme minimal agitation. I've found that I eliminated my unevenness problems when I gave up trying to adjust the developer temperature, and, instead, changed my times to match the existing temperature.
juan

 

[Ian Grant]

As Juan is indication Dilution & temperature are two entirely different factors.

I didn't mention in my previous post that I actually dish develop my 10x8's negatives at 24°C (75°F) using a dish-warmer (in the UK) at 1:1:50 deliberately to cut the development time/time spent in the dark.

The effects of dilution are very different to the time/temperature equation.

Ian