It is shown that comparative diffuse reflectance measured simultaneously on test and control specimens with a recording spectrophotometer affords a sensitive measure of color changes by light in undyed wool fabrics, especially of the “orange dip” caused by ultraviolet at 254 mμ. For this purpose comparative reflectance was found to be much more sensitive than absolute or relative reflectance or than comparative or simple transmittance. Transmittance in an immersion liquid, o-dichlorobenzene, was the least sensitive. An expression for calculating transmission from reflectance values is derived and applied. Optical properties of three fabrics are compared for the above uv and visible region.
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