EVALUATION OF SKIN COLOR 7 25 20 15 10 V • Zeiss RFC 3 -30mm Lovibond MKIT[ ...--•,.U • i i i i i 10 15 20 25 •0 Pl o P2 ß P3 ø ß P5 . o P7 • P8 • P9 [] P1o ' Pll [] Figure 3a. u*-v* color differences of the outer forearm of 11 persons measured using Lovibond MK III versus Zeiss RFC-3 with 30-mm viewing field diameter. The dotted lines represent the boundaries of the measurements of the two instruments. arm has a tendency to bulge into the measuring sphere. For the cheek this penetration is stronger. RESULTS The precision of measurement at the same occasion was determined by ten repeated measurements after repositioning of the measuring head in one subject by one observer. For the skin in the zygoma area the standard deviations were found to be 1.1 0.5 0.9 for L*, u*, v* respectively. However in more color-saturated skin areas these

JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS 65 60 55 50 45 Lovibond MK'm' , I I 5 I I I 10 I 20 25 30 P1 • P2 © P3 o P4 ., P• ß P• [] P7 •' P8 -'• P9 ß P1o ß Pll [] Figure 3b. L*-u* color differences of the outer forearm of 11 persons measured using Lovibond MK III versus Zeiss RFC-3 with 30-mm viewing field diameter.