Steve,
Just finished reading through the new 4th edition! Congrats.
It looks like WD2H+ is wrong again. The bisulfite is there, but now it's missing the pyro. In the preface, the reference to the WD2H+ error in the 3rd edition indicates sodium metaborate was missing (obviously it was bisulfite which was missing).
Congrats again on the new edition. Although I'm an "analog" worker I'm looking forward to reading the new section on digital negatives.
Best,
Michael
WD2H+ errata
WD2H+ errata
I can't f**king believe it (it's okay to use blue words if they're referring to your own stupidity).
One of the motivations for publishing the 4th edition was to rectify the error to John's WD2H+ formula in the 3rd edition. I appear to have overwritten pyrogallol, 60.0 grams when I inserted the sodium bisulfite.
Please don't anyone tell John until I've had time to shoot myself.
In the meantime, here is the corrected formula.
Here is the correct Solution A for WDH2+
WD2H+ (2003)
(John Wimberley)
SOLUTION A
Distilled water, 750.0 ml
*Benzotriazole, 0.2 g
Metol, 6.0 g
Sodium Bisulfite, 20.0g
Pyrogallol, 60.0 g
EDTA tetrasodium salt, 5.0 g
Distilled water to make 1.0 liter
SOLUTION B
Distilled water, 750.0 ml
Sodium carbonate, monohydrate, 110.0 g
Distilled water to make 1.0 liter
*For more accurate measurement, prepare a 1% solution by dissolving 1.0 gram of Benzotriazole in 100.0 ml of distilled water. Use 20.0 ml in place of 0.2 grams dry chemical.
Working Dilution for Normal and Reduced Contrast
Distilled water, 1600.0 ml
Stock Solution A, 25.0 ml
Stock Solution B, 25.0 ml
-2 EI 32 Develop 7 minutes
N EI 64 Develop 9.5 minutes
Working Dilution for Increased Contrast
Distilled water, 1600.0 ml
Stock Solution A, 25.0 ml
Stock Solution B, 50.0 ml
+2 EI 84 Develop 6.5 minutes
+4 EI 100 Develop 12 minutes
Developing Times and ISO ratings are for Ilford FP4+, tray processed with continuous agitation at 68F/20C. These specifications should also apply with slight adjustment to other medium speed films. For slower films, the developing times will need to be reduced by about 10%. For faster films, developing times will need to be increased by about the same amount.
One of the motivations for publishing the 4th edition was to rectify the error to John's WD2H+ formula in the 3rd edition. I appear to have overwritten pyrogallol, 60.0 grams when I inserted the sodium bisulfite.
Please don't anyone tell John until I've had time to shoot myself.
In the meantime, here is the corrected formula.
Here is the correct Solution A for WDH2+
WD2H+ (2003)
(John Wimberley)
SOLUTION A
Distilled water, 750.0 ml
*Benzotriazole, 0.2 g
Metol, 6.0 g
Sodium Bisulfite, 20.0g
Pyrogallol, 60.0 g
EDTA tetrasodium salt, 5.0 g
Distilled water to make 1.0 liter
SOLUTION B
Distilled water, 750.0 ml
Sodium carbonate, monohydrate, 110.0 g
Distilled water to make 1.0 liter
*For more accurate measurement, prepare a 1% solution by dissolving 1.0 gram of Benzotriazole in 100.0 ml of distilled water. Use 20.0 ml in place of 0.2 grams dry chemical.
Working Dilution for Normal and Reduced Contrast
Distilled water, 1600.0 ml
Stock Solution A, 25.0 ml
Stock Solution B, 25.0 ml
-2 EI 32 Develop 7 minutes
N EI 64 Develop 9.5 minutes
Working Dilution for Increased Contrast
Distilled water, 1600.0 ml
Stock Solution A, 25.0 ml
Stock Solution B, 50.0 ml
+2 EI 84 Develop 6.5 minutes
+4 EI 100 Develop 12 minutes
Developing Times and ISO ratings are for Ilford FP4+, tray processed with continuous agitation at 68F/20C. These specifications should also apply with slight adjustment to other medium speed films. For slower films, the developing times will need to be reduced by about 10%. For faster films, developing times will need to be increased by about the same amount.
Do it in the Dark,
Steve Anchell
Steve Anchell