Photoacoustic Spectroscopy for the Study of the Adsorption of Dyes on Wool Fabrics

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Abstract
Dyes have been applied to different wool fabrics and measurements by photoacoustic spectroscopy showed well‐defined absorption bands. Differences were found in the spectral properties of dyes, which appeared visually to be very similar, indicating that photoacoustic spectroscopy may be useful for the identification of dyes on wool fabrics. Photoacoustic spectroscopy was also shown to be capable of measuring two‐dye and three‐dye combinations and very dark colours. Comparisons with reflectance spectroscopy showed that photoacoustic spectroscopy might usefully complement the results obtained from reflectance measurements.