NATURAL HAIR COLOR 605 lOO 90 80 70 60 20. ASH BLONDE o o o o o o ASH BROWN O o WARM BLONDE WARM BROWN o DARK BROWN o TO BLACK LIGHT RED o o DARK RED o o 10 20 30 40 50 60 7 PURITY, P B•CENT Figure 4. A luminosity-purity plot for natural hair colors showing the relationship between subjective hair color names and luminosity and purity purity and 18% luminosity would be called dark, warm blonde, and so forth. The data from this work may be compared with earlier data ob- tained by Garn (3) and by Gardner and Mac Adam (5). Garn's data, ex- pressed in terms of the Munsell color system, are easily convertible to tristimulus notation by means of special charts (9). The data of Gard- ner and Mac Adam were obtained spectrophotometrically and, in part, reported in tristimulus notation (5). In Fig. 5, the data of Garn and of Gardner and Mac Adam are compared •'ith this work. The general agreement between the three sets of data is quite good, judging on the basis of range of purity and range of luminosity.

606 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS 90- 70- 50- 30- 22- 6 5- 3 2 c• ASH BLONDE ASH BROWN rq o WARM BLONDE E } [] [] __ o g WARM BROWN [] DARK BROWN TO BLACK LIGHT REO DARK RED DO [] /• DATA OF GARN [] DATA OF GARDNER AND MACADAM • DATA OF DEN BESTE AND MOYER 2'0 •'0 4'0 50 60 7'0 8 PURITY, PERCENT Figure 5. Luminosity-purity plot of natural hair colors including data of Gardner and Garn Gardner and Mac Adam reported subjective color names along with tristimulus values (5). These descriptions fit the classification of Figs. 4 and 5 fairly well, with a slight discrepancy as to luminosity. Garn did not use subjective color names instead, he described his colors directly in terms of the Munsell notation. To complete the comparison between his data and those reported here, subjective hair color names were as- signed to the Munsell chips Garn referred to on the basis or guess of how hair would look, not how the chips look. The reason for this is that the subjective names we give to hair colors do not always seem reasonable