SKIN ROUGHNESS ASSESSMENT 297 record even small differences," where the results for specified commercial products are passed on to the consumer for his information and as buying recommendations. REFERENCES (1) K. Schrader, Grundlagen und Rezepturen der Kasmetika, 2. Auflg. (Hiithig Buch Verlag, Heidelberg, 1989). (2) K. Schrader and S. Bielfeldt, Comparative studies of skin roughness measurements by image analysis and several in viva skin testing methods, J. Sac. Cosmet. Chem., 42, 385-391 (1991). (3) Sonderheft, Kasmetik (Stiftung Warentest, Berlin, 1992). (4) J. H. Zar, Biastatistical Analysis, 2nd ed. (Prentice-Hall, Englewood Cliffs, NJ, 1984). (5) G. Padberg, Modifizierte Methylenblau-Methode zur Priifung des Rauhigkeitsgrades der Haut- schicht, J. Sac. Cosmet. Chem., 20, 719-728 (1969).
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