sodium thiosulphate
Definition
- Noun:
- A chemical compound used as a fixing agent in photography: Sodium thiosulphate is a white, crystalline compound that dissolves silver salts, making it essential for fixing photographic images by removing unexposed silver halide from film or paper.
Usage Examples
- Noun:
- The darkroom technician prepared a solution of sodium thiosulphate to fix the prints.
- After development, the film must be immersed in sodium thiosulphate to make the image permanent.
Advanced Usage
- "Hypo": A common historical and informal name for sodium thiosulphate in photographic contexts.
- The photographer asked for more hypo, referring to the sodium thiosulphate fixer.
Variants and Related Words
- Sodium thiosulfate (n): The standard American English spelling of the compound.
- Sodium hyposulphite (n): An older, now largely obsolete name for the same substance.
- Fixer (n): A general term for a chemical solution, often containing sodium thiosulphate, used to make photographic images permanent.
- The fixer solution typically contains sodium thiosulphate.
Synonyms
- Hypo (n): Informal synonym derived from "hyposulphite."
- Photographic fixer (n): Describes its primary functional use.
Related Phrases
- Fixing bath (n): The solution containing sodium thiosulphate used in photographic processing.
- The film is transferred from the developer to the fixing bath.
Noun
-
a compound used as a fixing agent in photographic developing
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