Photographers' Formulary Sodium Sulfite | Anhydrous, 100g
This is 100g of anhydrous Sodium Sulfite from Photographers' Formulary. It is most commonly used as a preservative in developing agents and is also an active energizer in Amidol development. It is also used within acid fixing baths and as a blackener for negative intensification processes.
Darkroom Chemistry |
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| Synonyms | Sulfite of Soda Sodium sulfite anhydrous Disodium sulfite Sulfurous acid, disodium salt Exsiccated sodium sulfite |
| 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. |
| Weight | 3.5 oz / 100 g |
