Very interesting, Mustafa, especially the table of fog characteristics for various reducing agents. The greatest fog was seen with the non-staining D-76 and p-phenylenediamine (the reducing agent in Harvey's 777.) Both the D-1 (ABC pyro) and standard amidol forumulae exhibited only 2/3 as much fog.
I'll have to try this on film. BTW, if you add 3 grams of citric acid and 3 ml of 10% KBr to what the article defines as the "standard formula" you have Michael Smith's amidol formula.