Brightness is referred as the proportion of reflectance of
blue beam only at a wavelength of 457 nm. Whiteness refers to the degree that paper
diffusely replicate beam of all wave lengths right through the visible band.
Whiteness is an appearance phrase. Color is a visual value. Color might appear dissimilar
when viewed underneath a diverse light source. Brightness is randomly defined,
but cautiously standardized, blue reflectance that is used throughout the pulp
and paper industry for the managing of mill processes and in definite types of R&D
programs. Brightness is not whiteness. However, the brightness values of the
pulps and pigments available into the paper offer an exceptional measure of the
maximum whiteness that can be achieved with accurate tinting. The color of
paper, like of other materials, depends in a complex manner on the
characteristics of the observer and a numeral of substantial factors such as
the spectral energy division of the illuminant, the geometry of illuminating
and screening, the nature and scope of the encircle and the ocular
characteristics of the paper itself.
Color is related to perception and therefore measured or
specified in terms of color space. A commonly used system is the CIE L, a, b
system. This is based on the idea of color opposites.
L - Measure of luminance and varies from 100 for
perfect white to 0 for perfect black.
a - Redness to greenness.
b - Yellowness to blueness.
a - Redness to greenness.
b - Yellowness to blueness.
Goodrich Agrochem’s Coating & Laminating Binder products are an excellent carrier for optical brightening agent & pigments.
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