RISK-BEARING SUBSTANCES IN COSMETICS 191 I Original sample extract • I0 Note the uncommon base-line 1 touch between peak 3 and 4. 130øC column temp. 1 1 sample + extra Hydroquinone-sil. . ] Original Original sample + extra• Hydroquinone- sil Note the common base-h'ne J • approach between 3 and 4. J Note the clear separation of • 130oc • 3- 4C-4D. / column temp. • 4D • Figure 8. The problem of the quasi-hydroquinone peak of sample no. 25. 1. Solvent peak (ethyl acetate). 2. Nitrobenzene (internal standard). 3. Resor- cinol-sil. 4A. Quasi-hydroquinone-sil. 4B. As 4A + superposed hydroquinone- sil. 4C. Hydroquinone-sil. 4D. The quasi-hydroquinone-sil peak, identified as chlororesorcinol-sil.

192 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Brand G (6 samples): 6 with 25TDA 1 with 2AF 5 with 3AF 4 with 4AF 1 with 2NPFD 1 with AN 2 with 24DAA Brand H (12 samples): 6 with 25TDA 6 with 2NPFD 6 with RES 1 with HCH 2 with AN 1 with CRES Brand I (9 samples): 7 with 25TDA 7 with 3AF 1 with 2NPFD 7 with RES Brand J (2 samples): 2 with 25TDA 2 with 3AF 2 with HCH 1 with AN Unidentified spots: 8 Conclusions: No p.phenylenediamine was found. 2.5.Toluylenediamine and Resorcinol were the most important compounds. The 3 isomeric aminophenols are frequently used. 2.nitro.p.phenylenediamine is much used, 4.nitro.o.phenylene- diamine less. Of minor importance are: e-naphthol, hydroquinone, chloro- resorcinol, 2.4.diaminoanisol. Abbreviations: 25TDA = 2.5.Toluylenediamine 2AF = 2.Aminophenol 3AF = 3.Aminophenol 4AF = 4.Aminophenol 2NPFD = 2.Nitro.p.Phenylenediamine 4NOFD = 4.Nitro.o.Phenylenediamine RES = Resorcinol CRES = 2.Chlororesorcinol HCH = Hydroquinone AN = e-Naphthol 24DAA = 2.4.Diaminoanisole. THE ANALYSIS OF SUNTAN PREPARATIONS Suntan preparations may contain several classes of potentially hazardous sub- stances to man, such as sunscreens (uv absorbers), browning agents (mainly dihydroxyacetone), and local anaesthesics (for instance ethyl p.aminobenzoate or benzocaine and lidocaine). These cosmetics are applied on large surfaces of the