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This is 30g of Sodium Hydroxide from Photographers' Formulary. It is commonly used as an accelerator or alkali to activate low-energy developing agents, such as hydroquinone. It also is added to increase overall contrast with developers.
Synonyms |
Caustic alkali Caustic soda Hydrate of soda Soda lye Sodic hydrate Lye Sodium hydroxide solid Sodium hydrate Red Devil Lye Mineral alkali |
Appearance |
White, deliquescent pellets or flakes Odorless |
Uses |
High-energy accelerator or alkali sometimes used to activate low-energy developing agents (e.g. hydroquinone). Caustic alkalis are most often used where a powerful and quick-acting developer is required. Developers compounded with caustic alkali have poor keeping properties and are soon exhausted. |
Chemical Formula | NaOH |
Notes |
Store in a well-sealed bottle. Weigh it rapidly as it can pick up moisture from the air and change its weight. Cautions: Of all the chemicals commonly used in the black & white darkroom, this is perhaps the most caustic. It is the same chemical used in many commercial drain cleaners. |
Weight | 1.1 oz / 30 g |