Question

Which reaction is used in Black and White photography?

Answer 1

Black and white photography mainly depends upon the light sensitive material that helps in forming such contrasting images.

That material is AgBr.

When exposed to AgBr, the image then forms on the film.

While the image is developing, sodium sulphate, an oxidised reducing agent converts the AgBr remains into visible metallic surface.

Answer 2

Explanation:

In plain terms, in black and white photography, acid-base reactions occur. Light reacts with silver halide crystals to form an image. Electrons are kicked out when the photon energy from the light excites particles. This happens while in contact with the emulsion on the paper. A developing solution magnifies this reaction when the paper is placed in it . As a result, the silver sticks together and darkens in some places, forming the image. This has to be done in a dark room since previously exposed paper will turn all black.