Monday, June 19, 2017

Parodinal, another alternative

Parodinal is a clone of the famous developer Rodinal, from AGFA. It has a very long shelf life and can be used in concentrations from 1:10 to 1:200. However, when diluted it should be used in the next hours. It may be used for paper in the strongest concentrations and for film or plates for the more diluted baths.

Taking this formula as starting point, let us translate it to 500 ml, doubling the contents:

30 g Paracetamol
100 g Sodium Sulfite
40 g Sodium Hydroxide

I had many difficulties to get Sodium Sulfite at local suppliers. So, I started thinking about alternatives using Potassium Metabisulfite instead. Using a chemical balance calculator like this one, I realized that following equation is valid:

K2S2O5+NaOH = SO3K2 + SO3Na2+H2O

The first term is Potassium Metabisulfite and Sodium Hydroxide and the second is Sodium and Potassium Sulfite and some water.

From 80 g Potassium Metabisulfite and about  30 g Sodium Hydroxide, one gets about 100 g Sulfites that may replace the 100 g Sodium Sulfite given in the formula above. This leads to following new recipe:

30 g Paracetamol
80 g Potassium Metabisulfite
70 g (40+30) Sodium Hydroxide

It works very like Rodinal, same times and dilutions.

Following photos were made with an Agfa Clack camera, using Ilford Delta 100, developed with this last recipe in dilution 1:100 for 60 minutes in stand development:

Saturday, June 3, 2017

More coffee, please!

Like I promised, I changed the last universal developer recipe like this:

800 ml water
3 g Potassium Metabisulfite
6 g CD4 (color developer for C-41)
30 g Soluble coffee
35 g Potassium Carbonate
1,5 g Potassium Bromide
Water to make 1 Liter

I developed for 12 minutes with constant agitation at room temperature, bleached and fixed. Perhaps I could have done 15 minutes too, the results would not be so different, I think.

Because coffee is acidic I raised slightly the Potassium Carbonate content and I got evidently better negatives and the difference can be appreciated by sight.

One of the 8 photos made with an Agfa Clack and expired Fujicolor Superia 100: