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William Lindley
22-Oct-2009, 08:27
Any Ideas on developing Efke - 100 speed in Pyrocat?

Jan Pedersen
22-Oct-2009, 13:35
A good starting point is 12 minutes in 2+2+100 20C. You can use 1+1+100 but the time will be closer to 18 minutes and the overall stain will increase quite a bit.
Both times are for continuous agitation.

Blumine
22-Oct-2009, 15:24
Jan,

What are you processes are you printing in? I just delivered 100 sheets of Efke 100 and will print in Platinum.

Regards.

Blumine

Jan Pedersen
22-Oct-2009, 15:32
Blumine, Same process as yours Pt/Pd.

Tom Keenan
22-Oct-2009, 17:29
I just completed a round of zone system testing on a new batch of Efke PL100 (emulsion 910649) developed in PF Pyrocat HD in glycol (2/2/100). Film test resulted in package speed of 100. 8 minutes at 21.1 C yielded at Zone VIII log density of 1.28 and a density range (VIII-I) of 1.19. Zone VIII density increased to 1.39 at 10 minutes and went to 1.49 at 12 minutes. I did not see an appreciable increase in fb+f from going to 12 minutes (.09 at 8 minutes and .12 at 12 minutes). Everything done in a JOBO at the slowest rotation possible. All desitometer readings are blue channel. I hope this info is helpful to you.
Tom Keenan

Erik Larsen
22-Oct-2009, 17:41
Hi William,
I use 10 minutes 1+1+100 for silver printing rated at 80iso.
I use 15 minutes 2+2+100 for carbon printing rated at 80 iso.
regards
erik

Donald Miller
22-Oct-2009, 20:36
A lot depends on what type of agitation that you plan on using. Tray processing will have a markedly different time than semi stand processing in tubes which will have a totally different time than film in a drum on a motor base.

Beyond that the density range that you are striving for will be totally different on silver gelatin compared to Lodima or Pt-pd or carbon. Beyond the targeted density range is the matter of the luminance range in the photographed scene... a scene or subject that has five stops of luminance will need a totally different developing time than a scene/subject that has 8 stops of luminance.

Donald Miller