Question

What type of reaction involved in black and white photography.

Answer 1

Decomposition reaction of $AgCl$

1.Silver chloride$(AgCl)$ gets easily decomposed on exposure to light.

2. It loses its opaque white appearance on exposure to light and changes into chlorine(Cl2)(Cl_2)(Cl
​2) and silver$(Ag)$. So, the decomposition reaction of $AgCl$ is used in black and white photography.

$2AgCl\left(s\right)\stackrel{sunlight}{⟶}2Ag\left(s\right)+C{l}_2\left(g\right)$

3. Silver bromide$(AgBr)$ is also used in white and black photography due to its light-sensitive property.

$2AgBr\left(s\right)\stackrel{sunlight}{⟶}2Ag\left(s\right)+B{r}_2\left(g\right)$

Black and white photography

• Black and white photography is the most prominent example of monochrome photography, as it represents subjects in varying shades of neutral gray, but includes no other colors.

• In monochrome photography, tones of a single color are used to represent all the different colors within an image
• Silver Bromide is used in black and white photography. A photographic film is coated with silver bromide.