Making my own D19 developer - advice on how to modify it for my purposes appreciated
I shoot two formats mostly nowadays almost at the opposite end of the format spectrum - 16mm cine and 8x10 ...
I do reversal developing in the 16mm and Pt/Pd contact printing with the 8x10.
For both formats I use Kodak D19 - its great for the higher gamma needed for Pd prints and is listed as a good substitute for D94 in the 16mm world - However, as my supply is running low and I dont want to order from overseas any longer I want to mix my own with chems bought here - the mix is as follows:
Water at 50°C (125°F): 500 ml
Elon (Kodak's name for Metol): 2.0g
Sodium sulfite, anhydrous: 90.0g
Sodium carbonate, monohydrated: 52.5g
Potassium bromide, anhydrous: 5.0g
Add water to make 1L
Since I am investing some time into make this myself I thought it would be prudent to find out what each component of the mixture does and what the effects on film would be with addition of extra or less of these components... A sort of reverse engineer if you will ;)
Any knowledge appreciated!
the reversal developing says I good putting in sodium thiocyanate - as I have been doing... what does this do also ?
PotaIn Kodak Developer D19, the Restrainer is Potassium Bromide
In Kodak Developer D19 recipe, the Restrainer is Potassium Bromide. I don't have the HC110 recipe (it is closely held by Kodak).
Originally Posted by nick mulder
Potassium Bromide is the Restrainer in D-19
Here are the recipes for Kodak D-19, Kodak D-19b and Agfa 80. Sheet 1 and Sheet 2 of the attached Excel File.
You will notice that both Kodak D-19b and Agfa 80 have less Potassium Bromide and less Sodium Sulfite than Kodak D-19. Agfa 80 uses 60 grams/liter of Potassium Carbonate vs 48 grams/liter of Sodium Carbonate in Kodak D-19.
You could add some Benzotriazole solution to any of these developers. Benzotriazole is an organic restrainer and will decrease fog and also decrease Effective Film Speed.