Fluorescence Measurement in Optically Brightened Textiles
topic
Spectrophotometric measurement of optically brightened textiles requires UV-calibrated instruments with controlled UV content in the illuminant, as optical brighteners absorb UV and re-emit visible blue fluorescence that adds to substrate reflectance in a UV-content-dependent manner; ISO 105-B08 defines methods for quantifying the fluorescence contribution and its variation with illuminant UV content.
Role
Addresses the instrument-dependent measurement variability introduced by optically brightened textile substrates whose apparent whiteness and colour depend on the UV energy content of the measurement instrument illuminant, requiring standardised UV calibration procedures that enable comparable brightness and colour measurements across different spectrophotometer types and brands.