Edwal Sodium Sulfite is a photo-grade powder, that may be used in any photographic formula.
Sodium Sulfite is packed in an unbreakable 2 lb. plastic jar containing a speed cups.
When added to FG7 1:15 dilution in a 9% solution it produces a fine enough grain on medium and high speed films for practically any degree of enlargement
By adding 10 grams of Edwal Sodium Sulfite per liter to exhausted fixer, it helps stabilize the fixer for silver recovery
It is also used commonly to clear Polaroid black & white negatives in the Field or in the studio
Synonyms
Sulfite of Soda
Appearance
White Granular Crystals, or powder
Uses
As a preservative of developing agents Constituent of the acid fixing bath Blackener in negative intensification Active energizer in amidol development To clear Polaroid Type 55 black & white negatives
Chemical Formula
Na2SO3
Notes
Sodium sulfite is the most widely used preservative in developers. It also plays an important part in the process itself.