Quote Originally Posted by jdef
http://www.photoformulary.com/DesktopModules/StoreProductDetails.aspx?productID=92&tabid=9&tabi ndex=2&categoryid=31&selection=0&langId=0

ABC Pyro Plus appears to be the formula developed by Harald Leban and first introduced by him as ABC+, without Pyro in the term. It was later made available in kit form by Bostick and Sullivan as Rollo Pyro, after considerable testing by Carl Weese, which he describes in the book The New Platinum Print which he wrote with Richard Sullivan of Bostick and Sullivan. My personal opinion is that the name given the formula by Formulary is confusing because in fact what they sell as ABC Pyro Plus is the same as Rollo Pyro, and these are very different formulas from what most of us know as ABC Pyro (really the old Kodak D-1 formula).

In any event Leban himself posted the formula on the web some years ago, and I have posted it a time or two myself. In the hope of clearing up some of the confusion that exists about these formulas I am going to post it here again, together with some notes taken from a manuscript on which I am currently working.


ABC+

Stock Solution A
Distilled water . . . . . . . . . . . . . . . . . . . 800 ml
Metol . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 g
Sodium Bisulfite*. . . . . . . . . . . . . . . . . . . 20 g
Pyrogallol . . . . . . . . . . . . . . . . . . . . . . . . . 150 g
Ascorbic acid (Vitamin C) . . . . . . . . . . . . 5 g
EDTA - Na4 . . . . . . . . . . . . . . . . . . . . . . 2.5 g
Potassium Bromide 1.5 g
Distilled Water to. . . . . . . . . . . . . . . . . . 1000 ml

Stock Solution B
Distilled water . . . . . . . . . . . . . . . . . . . . 800 ml
Sodium Metaborate . . . . . . . . . . . . . . . ...300 g
Distilled Water to 1000 ml


For use: The standard dilution is 2:4:100. ABC+ was designed as a substitute for PMK with rotary processing and is said to provide even development with tube processors running at 25 rpm.

Characteristics: With a working solution that consists of a whopping 7.5 g of reducer per liter of working solution Rollo Pyro falls well outside of the range generally associated with high definition developers. Rolo Pyro is a very high energy developer that provides virtually no compensation, and very little if any enhanced sharpness through the development of adjacency effects. However, most films developed in Rollo Pyro develop a high level of image stain which serves to minimize graininess.

Compare the formula of this developer, what you may call it, and you will see that it is much different from the original ABC Pyro and will not give the same results.


Sandy King