Usage : For measuring the ISO Brightness , colour , colour difference , fluorescence and opacity of paper.
Definition :Brightness is a commonly used industry term for the numerical value of the reflectance factor
of a sample with respect to blue light of specific spectral and geometric characteristics. This method requires an
instrument employing 45° illumination and 0° viewing geometry with the illuminating and viewing beams adjusted so that translucent materials are evaluated on an arbitrary but specific scale .
the directional reflectance is measured at 457 nm.
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