"The standard is
usually a stable material with a high and fairly constant absolute
reflectance (e.g., Teflon, barium sulfate, magnesium oxide,
high-purity alumina ceramics). Standard is a material that absorbs no light at any wavelength and
reflects light at an angle identical with the incidence angle."
(Critical Review
Near-infrared spectroscopy in the pharmaceutical
industry
M. Blanco*, J. Coello, H. Iturriaga, S. Maspoch and C. de la Pezuela
Analyst, August 1998, Vol. 123 (135R–150R))
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