👉 In physics, blackening refers to a phenomenon where a material changes its color or appearance due to absorption of light. This occurs when an object absorbs light and causes it to appear blacker than normal.
For example, if you shine a bright white light onto a dark surface, the light will be absorbed by the surface, causing the surface to appear black. Similarly, if you shine a blue light onto a dark surface, the light will be reflected back into the surface, creating a pattern of blue
blackening