QUANTITATION OF ERYTHEMA 455 .9 .8 .7 ÷ .6 I I I I ! ! I I I I I I I I I ! • I I t I I I I I I I 640 •20 •00 588 5•0 540 520 500 WRVELENGTH (rim] Figure 4. Absorption spectra of the same sites (refer to Figure 3) taken ten days later. Spectra of sunburned site (A) and non-erythematous site (B). REFERENCES (1) H. G. Bode, Uber spektralphotometrische Untersuchungen an menschlicher Haut unter besonderer Beruchsichtigung der Erythem--und Pigmentierungs-Messung, Strah/entherapie, 51, 81-118 (1934). (2) F. Daniels and J. D. Imbrie, Comparison between visual grading and reflectance measurements of erythema produced by sunlight, J. Invest. Dermatol., 30, 295-304 (1958). (3) I. M. Gibson, Measurement of skin colour in vivo, J. Soc. Cosmet. Chem., 22, 725-740 (1971). (4) B. L. Diffey, R. J. Oliver, and P. M. Farr, A portable instrument for quantifying erythema induced by ultraviolet radiation, Br. J. Dermatol., III, 663-672 (1984). (5) E. A. Edwards and S. Q. Duntley, The pigments and color of living human skin, Am. J. Anat., 65, 1-33 (July 1939). (6) S. Wann, K. F. Jaenicke, and J. A. Parrish, Comparison of the erythemogenic effectiveness of ultra- violet-B (290-320) and ultraviolet-A (320-400) radiation by skin reflectance, Photochem. Photobiol., 37, 547-552 (1983). (7) S. W. Babulak, L. D. Rhein, D. D. Scala, F. A. Simion, and G. L. Grove, Quantitation of ery- thema in a soap chamber test using the Minolta Chroma (Reflectance) Meter: Comparison of instru- mental results with visual assessments, J. Soc. Cosmet. Chem.. 37, 475-479 (1986). (8) P. J. Frosch and A.M. Kligman, The soap chamber test, J. Am. Acad. Dermatol, 1, 35-41 (July 1979).