THE ACTION OF HAIR SI'R_\\'S ON HAIR 311 and 4 represent graphs in which drying time was plotted against Log,. mean droplet size in cubic inches. As can be seen in Fig. 3, the two-second spray yields larger droplets than the one-second spray. The droplets are fairly evenly spaetd along the hair fiber, and a regularly diminishing droplet size is observed during drying. In Figure 4, it may be seen that, after a one-second Figure 1 Photograph of hair sprayed with dry hair spray ß ..•....i .. :•2! '•'" .• ...... 5.- . ß • .•'.7,. ß ß :'.":': "• ..... ":•' : Figure 2. Photograph of hair sprayed with wet hair spray -10. -II LOGe IN5 -12 -13 -14 •, 47 ' 2 second SI•Qy - •8 i [ -•-41 seco_nd sEr_ay o I 2 3 TIME IN MI•TES •TER SPRAYIN• LOG e •r,• - 12 -14 -15 -16 _ o I SECOND SPRAY 0 2 SECONSPRA 0 I I I i 2 3 TIME IN MINUTES AFTER SPRAY1NG Figure 3. Mean droplet volume in cubic Figure 4. Mean droplet volume in cubic inches inches: product "A" drying time as a change in w)lume: product "B" spray, giant droplets are formed, which then dry. However, after a two-second spray, droplets tend to disappear, probably because the alcohol thoroughly wets the hair fiber and forms a layer about the fiber and between the fibers. Microscopic examination of hair fibers sprayed with dry sprays versus wet sprays reveals the following: Figure 5 illustrates the case where hair is sprayed with a dry spray for two to three seconds, which appears to be normal usage since the average volume of a coiffure is 1000-3000 ec. The droplets, which dry considerably before striking

312 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS TABLE II Drying Rates of Hair Sprays on Hair from the Aspect of Droplet Size and Distribution Experimental Treatment Cubic Inches Log•, cu in. At A• A• A• A• A• A,, A2 A2 Ao A2 B• G 3.44 X 10 -7 B• Cs 0.46 X 10-7 B• Ca 0.15 X 10-* B2 G 18.30 X 10 -7 B2 C• 6.81 ( 10-7 B= Ca 0.56 X 10-7 B• C• 385.00 X 10 -7 B• C2 333.00 X 10- B• C:• 337.00 X 10 -7 B• C• 394.00 X 10-7 B• Cs 670.00 X 10 -7 B• Ca 19.00 X 10-7 14.88 16.89 18.01 13.22 14.20 16.70 -- 10.17 -10.32 - 10.30 --10.15 --9.61 - 13.13 TABLE III Experimental Layout and Analysis of Variance Curl Length Before and Alter Spraying A i a Bi c A• B• A• B• A• A • B= a A• A• B2 A• B= 3 25 2 75 2 75 2 75 3 75 3.25 3.50 3.25 Source of Variance Degrees of Freedom Sum A.? B• 2.75 A2 B• 3.25 A• B• 2.75 A 2 B• 3.25 A • B• 4.50 A = B• 4.75 A• B2 4.50 A= B2 4.75 of Squares Mean Square Between A's 1 1.72 1.72 Between B's I 4.78 4.78 Interaction 1 1.14 1.14 Error 12 0.68 0.06 Total 15 8.32 MSA 1.72 Ft - - - 28.67 MSE 0.06 MSB 4.78 Fs - - - 79.67 MSE 0.06 MSI 1.14 _ MSE Fo.o:, = 4.75 F, ol = 9.33 0.06 - 19.00 "A• = Dry spray with small droplets. •' A2 = wet spray. * B• = Length of tress before spraying. a B2 = Length of tress after spraying.