Originally Posted by jim appleyard
Dr. Lowe wrote a good deal about his work,
much like Crawley, and gave some context for their application.
Edwal 12 was compounded for the Midwest, Lowe was from Chicago. Shooting on overcast days is STILL a reality near the Great Lakes.
In the '30s and '40s, it was common to work to a much higher CI than we would ever consider.
Lowe specified a range of glycin that would work in the developer, in case you wanted to raise or lower the highlights. The standard formulation is 5 grams, and I believe that is how Photographers Formulary prepares it.
Lowe said you could go up to 10 grams, and as low as 2.
I use 2.5 grams, and with TMY, I get an S shaped curve with these values:
Zone II: 0.1 --- Zone V: 0.6 - 0.7 ---- Zone VII: 1.1 - 1.20
The look is very much like TXP, and I use it to shoot portraits in flat lighting. It seems to function like D76, whose normal times are a good place to begin with E12. As I use it, it seems that it IS D76, but whose highlights land at a greater density.
Much 'wisdom' has been lost over the several decades. Lowe explained the function of PPD was NOT to develop the image, but to 'energize' the metol and glycin to function normally, but at a much lower pH.
The way the film granularity is rendered isn't my big concern, but -to me- it is very acute, and much finer. It is NOT a solvent developer, and not at all like Microdol X.
E-12 is my N+1 developer. Mid-tone placement remains normal, and I can expose as if I were using my normal developer. The hint I would offer for using E-12 would be to use Zone V and Zone VII to determine your exposure and development time.
Dr. Sease's developers provided Lowe the foundation for his work on E10, 12, and 20.
As for 777, that is another story. I have a stack of writing by Harvey,
and will share it... later. The suggestion for using Harvey's 777, though, based on HIS intention, and my own experience, is to reduce the EI by half of what it would be for you in D76. And develop to a higher CI than you find normal: print on a softer paper. The aesthetics of the '30s were differnt than today !
Time for some coffee.