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Brightness
The reflectivity of paper for a specified blue light measured under standard conditions, on an instrument (brightness meter) calibrated and designed for this purpose. In paper, is the amount of light, diffusely reflected from a surface, compared to that which would be reflected from a block of bright Magnesium Oxide; measurement is made with a specific wave length of light (blue), with the surface of an opaque pad of paper being illuminated at a 45 degree angle and the reflection being measured at a 90 degree angle; the human eye sees only reflected light, and brightness influences printed contrast and the amount of illuminating light which is reflected.
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- Part of Speech: noun
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- Industry/Domain: Paper products
- Category: Writing paper
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