Saturday, October 28, 2017

Bill Williams CD4 Color Film Developer

Published in May 21, 2008 by Bill Williams at APUG, here is his recipe:

«Water 500ml @ approx 112 degrees
Sodium Sulfite (A) .5 grams (approx 1/8 tsp)
CD4 .35 grams (approx 1/8 tsp)
Potassium Iodide 1.8 milligrams
Potassium Bromide .25 grams
Potassium Carbonate (A) 4 grams (approx 2/3 tsp)»

The recipe is very minimal and precise about the amounts in grams and apparently  not accurate with fractions of tsp. But reading above the recipe, one can understand what he means. He used graduated inox recipients to measure exact solutions of Potassium Carbonate, Sodium Sulfite and Potassium Bromide. I only don't understand how he measured Potassium Iodide from a 1% solution.

I prepared following separate 500 ml each solutions:
  • 50 grams CD4 and 1,5 grams Sulfite as preservative only
  • 50 grams Sodium Sulfite
  • 50 grams Potassium Bromide
  • 50 grams Potassium Carbonate
I already had a 2% solution of Potassium Iodide. So I took 5 ml (that contains 100 mg) and add water to make 100 ml, so I ended with a 0,1% solution. To use 1.8 mg, I need 1,8 ml of this solution.

With a 5 ml syringe, I measure following amounts to prepare 500 ml of this developer:
  • 5 ml Sulfite 10% solution
  • 3.5 ml CD4 10% solution
  • 1.8 ml of Iodide 0,1% solution
  • 2,5 ml Bromide 10% solution
  • 40 ml Carbonate 10% solution
One of the last results


vourmat said...

The question is, how much time the film was in solution, 3.15, 6 or 10 minutes?

Henrique Sousa said...

Just like Bill Williams said: 8 minutes with constant and gently agitation.

vourmat said...

Yeah, it's clear, and the temperature is 45 ℃ or 112 ℉, or am I mistaken?

Henrique Sousa said...

Yes! 45ºC is starting temperature by mixing but it will drop until some 38 at the end of development. No heating during development.

vourmat said...

I purchased a color developer T-32, here I will show on it both C41 and Svema DS5M 1990 release. I will do a two-solution developer with only a lower color developer content than recommended.

Henrique Sousa said...

Great! I can't wait to see. I am also thinking about mixing a two-solution on the base of Bill williams developer. I will mix CD4 with sulfite on one side and the other components for solution B. I just want to calculate thinks in order to use equal parts of each to reach the final result.

vourmat said...

by the way here is cas 4327-84-8 color developer, in order to understand what kind of a T-32

Magento Developer said...

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