Roger - the flies around that horse do seem to give it the authenticity of deadness,
but if parathion had killed the horse, the flies would be dead too. Somewhere around
here I have some sandstone footprints of mesohippus, but perhaps that's just too
dead of a horse.
What is the purpose of Triethanolamine in the 510 formula? Is it the alkalie??
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Andrew,
The TEA acts as the solvent, into which the constituent chemicals are dissolved, and when mixed with water, acts as the accelerator.
When properly heated and mixed, what color should the 510-pyro concentrate be?
Mine boiled pretty quick and turned brown. Is it any good or should it be a lighter color?
For the sake of the archives, I will follow up to say it worked well. I went on to make 2 more batches... and will probably make a third later this weekend.
I'm glad it's working well for you, but I'm a little confused -- are you making up batches of of working solution, or concentrate? I usually make up a liter of concentrate at a time, but even 100ml of it will last quite a while. So, I assume your batches were of working solution?
I apologize for resurrect this thread if my question is not convenient.
I'm working with Pyrocat-HD diluted 2:2:100 and HP5 exposing the film as ISO 200. My "problem" is that I'm getting too much contrast and not sure what to do to reduce that contrast: should I agitate less? should I develop more? should I expose in a different way?
Domingo
There are others on this forum with much more experience with Pyrocat HD than I have. However, I use the same film and dilution you use except I use ISO 400. I develop for 7 1/2 min. at 68 degrees in BTZS tubes. The results are quite good.
HIgher film speed, (400), less agitation, shorter development time. You might also try a dilutionof 1:1:100. Please only change one thing at a time.I suggest increasing he EI to 400 as a start. Next change the dilution, then the agitation, then the time. The alternative is EI 400, developed 7- 8 min at 68 degrees, in 1:1:100 which is a pretty normal beginning point for this combination. Then use time to increase or decrease contrast. More time= more contrast; more agitation = more contrast; increased temperature = more contrast. Thin shadows result from under-exposure.
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