Quote Originally Posted by Joseph
Tom: I had read the APUG Mic-X formula.

1. How is Sodium Chloride (30 grams) different from Sodium Bisulfite
(7.5 grams) for one liter of Mic-X?

2. Does one liter require 7.5 grams of Metol or does 5 grams work OK?

Thanks fo your info.
Joseph, you asked:

1. How is Sodium Chloride (30 grams) different from Sodium Bisulfite
(7.5 grams) for one liter of Mic-X?

Sodium Chloride apparently acts as a weak restrainer in the Gainer version of the formulation. Again, it must be straight sodium chloride - no iodine.

Sodium Bisulfite acts as a developer preservative. It also acts as a pH buffer in combination with the sodium sulfite.

2. Does one liter require 7.5 grams of Metol or does 5 grams work OK?

The Kodak D23 and D25 formulations published by Morgan and Morgan in the 1977 Edition of The Compact Photo Lab Index, both call out 7.5 grams of Metol for 1 liter of stock solution developer.

Either of these developers can be diluted 1:1 or 1:3 to make a one-shot working developer (as can the official Kodak version of Microdol-X).

I have always used all three of these developers as 1:3 one-shot dilutions (the equivalent of 2.5 grams/liter of Metol) with good results.

With regard to diluting the 5 gram version 1:1 or 1:3, try it and see if it works for you.