A densitometer is an instrumental device used in the printing process to measure the optical density of ink on paper.
This quantitative assessment provides an accurate read of the concentration of ink, thereby enabling consistent colour reproduction.
It works by directing light onto the printed surface and then measuring the amount of light reflected back.
Where they are used, densitometers play a crucial role in maintaining colour accuracy and consistency across print runs.
However, modern techniques measure light refraction as well as density and are known as spectrophotometers, and have all but replaced densitometers in a modern print factory.