Re: PYROCAT-MC GLYCOL: Alternative Process Film Development
I did not mention the -P variant because it is not being offered commercially in kit form so one would have to mix their own. But both th -P and -MC versions offer some slight increase in apparent sharpness over -HD when developed with rotary processing. Also, the stain with the -P variant is less intense than with -MC and the grain is a bit more prominent, perhaps because of this.
At 1:56 PM -0600 11/29/06, Jeremy Moore wrote:
Sandy, What about the -P concotion? I thought it was to give higher apparent sharpness (at the cost of larger grain) when using intermittent agitation (such as tray processessing) -Jeremy- On 11/29/06, Sandy King <firstname.lastname@example.org> wrote:Mark, Results from the two formulas are similar, and you can basically use the same times with -MC as with -HD. The most fundamental difference is that you will get greater apparent sharpness with -MC in rotary (continuous) processing than with -HD, and if developing for the high contrast needed for alternative printing there will be slightly less B+F stain with -MC. The color of the stain is also slightly different with -MC, but so far as I can tell this not change results very much. In essence, if you want to do rotary processing I recommend -MC. For minimal and stand development I recommend -HD. For other intermittent types of agitation I recommend both. Best, Sandy At 10:44 AM -0800 11/29/06, Mark Booth wrote:I noticed that Sandy King is offering his new formula(s) of both Pyrocat-MC Glycol and Pyrocat-HD Glycol through Photographers' Formulary. I am interested in their staining properties contrasted to pyro for alternative printing. What are the primary differences between the two formulas? (Speed; Compensation/Expansion; Sharpness; Etc) When would one formula have preference over the other developer variant or are each very similar? I find the organic solvent approach very intriguing and practical for consideration. I primarily work with HP5 Plus; Bergger BPF 200; Acros 100; films. Most frequently use the Farber's shared, Pyro-triethanolamine formula. Thank you, Mark