Answer:
True
Explanation:
The film required to take a black and white photograph today is formed by a thin sheet of cellulose acetate (a type of plastic) covered by a layer of gelatin emulsion containing, in suspension, very fine grains of bromide of silver distributed homogeneously. When the cellulose acetate film is exposed to light energy (we take the picture), the light causes the silver bromide to pass into a state we call "excited or activated state"
This, in photography, is called "latent image formation" and the film is ready to be developed using a basic developer reagent containing hydroquinone (C6H6O2), an organic compound that has a reducing character and causes the reduction to occur from Ag (+) to Ag (o)
In this process, in addition, hydroquinone is oxidized to quinone (C6H4O2).
Therefore, a certain amount of metallic silver is deposited on the film, which is what gives the color to the cellulose acetate film.
The interesting thing about this redox process is that the amount of metallic silver particles formed on the film and, therefore, the intensity of the color within the gray scale, is directly proportional to the amount of light it received during the realization of the photography, so that the play of light and shadow of an image is reflected.
