Hi, with the generosity of Jesper I have received some APX 25. Normally I would process in Rodinal 1:50 or 1:100, but thought I may experiment with Pyrocat, any thoughts or processing times would be appreciated. The 25 seems to have fallen off the massive dev. chart, and I don't think it is the same as Efke 25.
Tony
I think this might be a good experiment for two-bath Pyrocat. It has worked fine for me so far with films of ASA 100 or below. See below.
Pyrocat-HD can also be used as a two-bath developer with excellent sharpness. For this I recommend a 1:10 dilution of both Parts A and B, with solution temperatures at 75F.
1. Water bath for three minutes. Not necessary for most films but I recommend the water bath for Fuji Acros, Tmax-100, Delta 100, and most fine grain films of ASA 100 or less.
2. Six minutes in Part A, with two inversions at the beginning, and two inversions at the 1/4, 1/2 and 3/4 points of development.
3. Pour our Solution A and pour in Solution B. No rinse between. Initial agitation two or thee inversions, then two or three inversions at the 1/4, 12 and 3/4 points of development.
4. Pour out B, pour in water and leave for five minutes.
The purpose of the relatively long time in B and the final water bath is to allow developer exhaustion for maximum adjacency effects.
When used this way Pyrocat-HD is a high acutance compensating developer.
Pyrocat-HD negatives with the two-bath method described above have higher acutance than with one bath development and intermittent agitation.
Both Solution A and Solution B can be re-used several times within a three-four hour period but should be discarded at the end of a development session as they will go bad in about 10-12 hours.
Sandy
