Term: REFLECTANCE FACTOR
Reflectance is measured on a scale of 0 to 1, at a wavelength or bandwidth of light (spectral response) specified in the particular application specification. Barium sulfate or magnesium oxide are used as 'near perfect' reference white standards (a perfect standard of pure white would have a reflectance of 1.00 at any wavelength of light). The absence of any light in a vacuum is used as reference black standard. Samples such as substrates, inks, etc. are tested against the standards under similar illumination.
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