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The fiber data collection in use in the Home Office Forensic Science Service uses complementary chromaticity coordinates as a method of color description. Color variation within samples is represented by an elliptical error region around the mean chromaticity point of the sample. For searching this collection, a method of matching single colors to the collection ellipses has been assessed. However, the necessary calculations are complex, so a number of simpler alternatives has been investigated. A simple box search has been found to be convenient, albeit with some reduction in specificity.

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Methods used in U.K. forensic science laboratories to establish a large fiber data base are described including details of the recording of fiber sources, types, and colors. Such a data base provides a firm foundation for the assessment of the significance of fiber matches encountered in casework.