Tint
Tint turns up in 2 fields: paper optics, automotive. Here is what it means to the people in each one.
Tint in paper optics
Companion value to CIE whiteness that tells whether a white leans toward green or toward red.
Calculated from the same chromaticity data as CIE whiteness, tint is positive when a white leans greenish and negative when it leans reddish, with zero meaning neutral. The whiteness formula is only considered valid inside a narrow tint window, so labs always report the two together. Overdosed optical brightener pushes tint toward green, while violet and red shading dyes pull it back toward neutral.
"Tint is sitting at plus 2 on the felt side, so bring the violet dye up a notch before it drifts any greener."
Tint in automotive
A darkened polyester film applied to the interior of vehicle windows to reduce glare and heat.
Installers apply this adhesive film to automotive glass to block UV rays, lower cabin temperatures, and provide privacy. The darkness is measured in visible light transmission percentage, with lower numbers indicating a darker shade. Poorly applied or cheap film will eventually bubble, turn purple, and peel from sun exposure.
"The customer wants five percent tint on the back glass and twenty on the doors so nobody can see inside."