Whiteness and Yellowness Indices for Textile Substrates
topic
CIE whiteness index calculated from CIE tristimulus values under D65 illuminant and CIE 1964 supplementary observer ranks white textile substrates from bluish white to yellowish white on a numerical scale, while CIE yellowness index from ASTM E313 quantifies the degree of yellow departure from white in bleached natural fibres and UV-degraded synthetic textiles.
Role
Provides objective numerical indices for specifying and monitoring the whiteness of bleached cotton, linen, silk, and optically brightened synthetic fibres that enable quality control of bleaching and brightening processes and specification of minimum whiteness thresholds for textile substrates used in white and pale dyed or printed product ranges.
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