Photography. A substance used to speed up development or (less commonly) exposure.

A solid yellow compound, C6H11NO7, obtained by the nitration of sugar and formerly used as a component of photographic film.

Photography. A chemical added to a developer which inhibits the formation of fog on a negative or print and also slows development. Cf. restrain, v.1…

Photography. A varnish used as a material in retouching. Obsolete.

Something that intensifies; an intensifying agent. Photography (see intensify, v. 1b).

a bath for arresting the process of the preceding bath, esp. development, by neutralizing any of its chemical that may still be present.

Photography. A substance used for producing an opaque area on a negative, as in retouching. Now historical.

Photography. An agent for bleaching a negative or print (see bleach, v.1 2c).

A thing that couples or links together. spec. Photography. (See quots.)

Photography. The liquid in which a newly developed photographic plate or print is washed.