Fluorescent whitening agent through the fluorescence reaction play a role. They absorbed wavelength below 400 nm invisible ultraviolet (uv) radiation, and through the electric physical change, release the light wavelength, basic at about 400 nm to 450 between the blue area of the visible spectrum. Because it contains a lot of ultraviolet irradiation lighting source, observed light is reflected and emitted light combined, so this kind of light from the paper contains whitening agent release later, have a more white than white color. If use "black", such as ultraviolet light lighting source irradiation contains whitener paper, often can see the effect.
Printed on containing fluorescent whitening agent base paper looks colour is not the same, because it depends on the used to watch the prints lighting light source whether it contains ultraviolet light.
Early printing measurement standards (except density standard besides) designated lighting light source for D50. Hypothesis base material is the same with D50 measurement, without considering the fluorescent whitening agent composition. In fact, in the actual observation with ultraviolet light conditions, see color are not consistent, but can't meet the requirements. These deviation, to try to in different workflow of color consistency measurement and management of the major challenges are put forward.
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