Opinions? Formulary Wimberley WD2D+ Pyro Developer Liquid
I am thinking of ordering Formulary Wimberley WD2D+ Pyro Developer Liquid for my first foray into Pyro - opinons?
Originally Posted by Kino
WD2D+ is an excellent developer. High acutance similar to PMK and Pyrocat-HD. It has been around a long time, since the 70s, in various reincarnations, mostly involving choice of restrainer. The current + formula is proprietary, so no one knows exactly what is in there, in contrast to PMK and Pyrocat-HD.
If you have not already done so please have a look at my article on Pyro Staining Devleopers at http://unblinkingeye.com/Articles/PCat/pcat.html. There is some good history there about pyro staining developers. You might also want to obtain a copy of Gordon Hutchins' Book of Pyro. No one has all the truth about thee developers so it pays to learn as much as you can to best now how to fit your specific requirments to the developer.
I gave Wimberley's tale of WD2D+ a good read; an
Originally Posted by sanking
article by him a few years ago in Photo Techniques.
His WDs are Carbonated-pyrogallol-metol brews.
He lists the ingredients for WD2D and his tweaked +
version. If I recall correctly the + is for Calgon, the
hexametaphosphate that is. It is the only ingredient
not common to both. I thought that strange as he
recommends only distilled water be used. Perhaps
his concern is with the chemistry itself.
For those that Home-Brew the formula for WD2D
is public domain. Dan
My speculation is that the + is for EDTA to get better sequestering.
Originally Posted by dancqu
By the, if you choose to mix the WD2D and decide to add the + as EDTA, use the alkaline (tetra?) rather than di 9 (acidic) version.
Thank you Sanking and Dancqu for your opinions and information. I will be ordering the Photographers Formulary liquid version to get started, so I will note the suggestions on "rolling my own" for later.
Thanks for the link to your article, Sandy! I shall read it in detail tonight.
Strangely enough, I DO have some experience with printing Pyro negatives, just not my own and they are silent motion picture negatives from the 'aughts and teens of last Century. I soon learned to carefully check for that characteristic stain, because my normal densities would go out the window suddenly on various shots within a motion picture negative. Invariably, they turned out to be pyro or other staining developer negatives that looked thin but took about 5 to 8 trims (0.025d lux) more exposure (depending upon end gamma) than a similar scene developed in what I assume was a non-staining developer. Of course, back then, cinematographers were responsible for developing their own film at the end of each day, so it depended upon who was shooting as to what soup they used. The pyro motion picture negatives, and I have timed and printed a few from Billy Bitzer (DW Griffith's cameraman) were stunning.
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EDTA, that rings a louder bell. Of course we do not
Originally Posted by sanking
know how much. I think it is the salt of a weak acid
so could act as a ph modifier and buffer were it in
some amount. Dan
I tried WD2D+ about 2 years ago and found it to be excellent, very forgiving. I never used distilled water, only tap and got very printable negs. My guess is that distilled water is recommended as a "safety net" for the creator of the formula as tap water can vary a great deal around the world. It's good standard to use.
I also did not agaitate the way Mr. Wimberly suggests. I agitated for the correct amount of time/minute, but only did it once/min.
Yikes! Why is the TF4 Fix so expensive, or does it just seem so in relation to the pyro developer? Is it pure Thio?
TF-4 uses 60% ammonium thiosulfate; a liquid. It cannot be kept in a dry powder state and a good part of your cost is shipping liquid from Montana to Ohio. It is good stuff, however.
You can also mix your own version, TF-3. TF-3 will not last as long as 4, and you still have to pay to ship a gallon of liquid amm. thio across the country. The formula is in Anchell's "Darkroom Cookbook".
Also in the "Cookbook" is a formula for an alkaline fixer made from sodium thio. Sod. thio comes in a crystal form and is cheaper to ship. It is slower than TF-3-4 and does not last as long.
Jim, thanks for that information.
Originally Posted by jim appleyard
Your posting jogged a memory of a motion picture processing tech once telling me that ammonium thiosulfate can be rejuvenated after silver has been recovered (reclaimed) and as long as the temperature of the process does not cook the fix and produce sulfides and ruin it, but I don't remember the actual process he detailed.
Of course, he was speaking of 500 to 1000 gallons of fix at a time, so it might not be an economical process for a small darkroom, but it bears investigation I think.