Pyrocat HD 2+2+100

Ian-Barber

Admin
Staff member
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My normal dilution for Pyrocat HD is 1+1+100.
I read about people diluting it at 2+2+100 and wondered what difference there might be in the outcome and why choose 2+2+100
 

Ian Grant

Well-Known Member
Registered User
I use 2+2 to 100 for tray processing 10x8 films simply because it requires a shorter development time sat in the dark, 9 minutes instead of 15 minutes. There's a slight increase in grain but not temotely noticeable with 10x8 :D

Ian
 

Alan Clark

Active Member
Registered User
When I first started using Pyrocat HD about 20 years ago I found I got excellent results with 35mm HP5 in1+1+100, at a time of 15 minutes for film exposed at 200 in sunny conditions. This time seemed a bit long, so I tried the 2+2+100 solution. This brought the time down to 10 minutes. But it also resulted in a noticable increase in grain. I quite liked a bit of grain at the time and was also developing 35mm Hp5 in Rodinal. The grain from Pyrocat 2+2+100 was about the same as you get from Rodinal. This was definitely noticable in a normal sized print from a 35mm negative, but it didn't show up in a normal sized print from a 5x4 negative. So I standardised on the 2+2 +100 for my 5x4 negatives which I was developing at the time in the dark in an open tray. So shorter development times were quite handy. And Istopped using Rodinal because I found Pyrocat to be a much better developer.
Eventually I stopped using Pyrocat when I could no longer get the raw chemicals easily. and switched to ID11 and Perceptol at 1+3. Ironically, this put me back to long development times. But I really like the results...

Alan
 

Ian-Barber

Admin
Staff member
Registered User
It was the increase in grain I was wondering about especially for 35mm so in view of that, I think I will stay with 1+1+100 for 15 mins with HP5 as this is what I am using on 35mm
 

Ian Grant

Well-Known Member
Registered User
Rate of development due to concentration has an effect on grain size one way around this used in a few developersin the late 1930's into the 1950's was to use Sugar or a Glycol to slow the rate of deveolpent. Ilford's Exttra Fine Grain Developer ID-44 used Dextrose (Glucose) and Salicylic Acid (Aspirin).

Ian
 
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