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Photo Forum / Film Photography / Darkroom / March 2004Crone:C Additive & Formulary Excel
Can anyone share their experiences with either of these? What do they actually do? How do they do it? What's in them? Are there any ryo equivalents? -Lew > Can anyone share their experiences with either of these? What do they > actually do? How do they do it? What's in them? Are there any ryo > equivalents? > -Lew Well, I'm not a chemist and I don't know specifically whats in them, but they are flammable, so be careful. I've used both...Crone:C for film developed with D-76, and the Excel using Hutching's Pyro developer, since Crone:C will not work with Pyro. Both gave excellent results. Instead of having my clients take the extra 1 stop in film speed this gives, I had them shoot it to the normal rating, and we would "pull" the development accordingly. This meant shorter dev. times and less time in solution. Both open the shadow areas without blocking up the highlights, although the Excel with Pyro could if not done correctly. Hope this helps. Alexis www.alexisneel.com Alexis: Thanks for the reply. Crone:C is, indeed, flammable. That's because the solvent is isopropanol as opposed to water. I suppose that gives a longer shelf life (like Rodinal?) since there's less dissolved O2. I don't believe that the Excel is flammable however. I'd still like to know what's in them. -Lew > Thanks for the reply. Crone:C is, indeed, flammable. That's because the > solvent is isopropanol as opposed to water. I suppose that gives a longer > shelf life (like Rodinal?) since there's less dissolved O2. I don't believe > that the Excel is flammable however. > I'd still like to know what's in them. > -Lew There is'nt any alcohol in Rodinal. That alcohol may be used because it dissolves more so some of the Crone:C constituents. Dan Alexis ...btw, did you notice any effect on grain or other effects? -Lew > Alexis > ...btw, did you notice any effect on grain or other effects? > -Lew No, no increase in grain or anything else. TYhe purpose of the 2 is to open the shadows, which it does nicely. Alexis www.alexisneel.com > No, no increase in grain or anything else. TYhe purpose of the 2 is > to open the shadows, which it does nicely. > > Alexis My guess, a phenidone additive. The alcohol may be a pointer in that direction. Phenidone is a non-hazardous substance so need not be mentioned on the lable. That thanks to Patrick Dignan. Phenidone is credited with giving a greater film speed. Dr. M. J. Gudzinowicz in discussing the developer Perfection XR-1 points to the LARGE amount of phenidone as the reason for the tremendous uping of the ISO. To read more search this NG for it. BTW XR-1 was news about twenty years ago; very good results at a two or three stop increase in film speed. I do Home-brew and have all the ingredients so will likely test it someday. Dan |
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