sodium thiosulphate

Thân thiện

A student dissolves sodium thiosulphate in a beaker of water.

Definition

1. 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.

Học thuật

Noun

1. a compound used as a fixing agent in photographic developing

Từ đồng nghĩa

• hypo
• sodium thiosulfate