NEW! We're excited to announce two new radiology learning pathways by Andrew Dixon and Frank Gaillard LEARN MORE

Fixing solution

Fixing solution is used in the darkroom to fix (i.e. remove unexposed silver) the developed and rinsed x-ray film in conventional radiography.

  • fixing agent: sodium/ammonium thiosulfate, dissolves unexposed silver
  • hardener: potassium alum, to harden the gelatin emulsion in film
  • acidifier: sulfuric/acetic acid, to remove any residual alkalinity from previous developing

After fixing, washing under running water is done, which is then followed by drying of the x-ray film.

Physics and imaging technology: x-ray

Article information

rID: 36757
Tag: refs, refs
Synonyms or Alternate Spellings:
  • Fixer
  • Fixer solution
  • Fixing

ADVERTISEMENT: Supporters see fewers/no ads

Updating… Please wait.

 Unable to process the form. Check for errors and try again.

 Thank you for updating your details.