sodium thiosulfate
Definition
- Noun:
- A white crystalline compound (Na₂S₂O₃) used primarily as a fixing agent in photography: Sodium thiosulfate is an inorganic chemical that dissolves unexposed silver halides from photographic film or paper, making the image permanent.
- A chemical with applications in water treatment and medicine: It is also used to dechlorinate water and as an antidote for cyanide poisoning.
Usage Examples
- Noun:
- The photographer immersed the print in a bath of sodium thiosulfate to fix the image.
- Sodium thiosulfate is effective in neutralizing chlorine in swimming pools.
Advanced Usage
- "Hypo": A common historical and industrial nickname for sodium thiosulfate, especially in photographic contexts.
- After development, the film was transferred to a hypo bath.
Variants and Related Words
- Sodium thiosulphate (noun): An alternative spelling, chiefly British English.
- Thiosulfate (noun): The anion (S₂O₃²⁻) or any salt containing it, of which sodium thiosulfate is a common example.
- Fixer (noun): In photography, a solution (often containing sodium thiosulfate) used to fix images.
Synonyms
- Sodium hyposulfite: An older name for the compound.
- Hypo: A common short form in photography.
Related Phrases
- Fixing bath: A solution containing sodium thiosulfate used in photographic processing.
- The final step is to rinse the print thoroughly after the fixing bath.
Noun
-
a compound used as a fixing agent in photographic developing
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