Photography. The process of rendering (a negative, etc.) permanent; concrete that which fixes.

The salt formerly called hyposulphite, now thiosulphate, of soda, used for fixing photographic pictures. Also attributive.

Photography. A solution used for making a photographic image permanent; a fixing solution. Now rare.

(a) Photography the bath in which a developed negative or positive is plunged in order to fix it; (b) Tanning (see quot.).