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Sodium Carbonate from Photographer's Formulary is commonly available in anhydrous and monohydrous forms. The crystalline form is available as Arm & Hammer Washing Soda, which is sodium carbonate decahydrate (use the yellow, unscented box). This can be safely substituted in almost all formulas calling for carbonate.
Table of Contents
Soda Sal soda Soda ash Washing soda Carbonate Carbonate of soda Carbonic acid, disodium salt; disodium carbonate Soda ash
White, odorless granular powder that absorbs moisture from the air
One of the principle alkalies (accelerators) used in development
Balanced Alkali (Kodalk) can be used as a substitute for carbonate or vice versa.
Cautions: Sodium carbonate releases a gas when added to an acid stop bath or an acid fixing bath; this gas may cause pinholes, or "blistering," to develop in film emulsions.