474 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS C.I.E. data (average) Table Ib Control 2--Mikro pulveriser % Pigmcnt 0.10 0.30 1.00 3.00 10.00 x 0.325 0.335 0.353 0.377 0.410 y 0.319 0.320 0.322 0.327 0.332 z 0.356 0.345 0.325 0.296 0.258 Yc• 76.350 65.500 47.510 32.940 20.920 x Yci•- Table Ic MoritZmixer 0.328 0.318 0.354 73.280 0.339 [ 0.357 0.319 0.322 0.342 0.321 61.170 i 45.190 0.384 0.327 0.289 29.950 0.411 0.332 0.257 19.880 Table Id Papenmeier mixer x z 0.329 0.319 0.352 71.960 0.340 0.320 0.340 59.870 0.356 0.322 0.322 44.600 0.381 0.326 0.293 30.990 0.414 0.332 0.254 19.100 Reflectance data (average) Table IIa Control 1 • Pigment •oR4OO K/S4oo R5oo K/S5oo R6oo K/S6oo R7oo K/S7oo] 0.10 79.27 0.0271 80.94 0.0225 88.73 0.0072 92.07 0.0034 0.30 69.46 0.0671 69.43 0.0673 81.49 0.0210 87.89 0.0084 1.00 58.42 0.1480 58.17 0.1504 73.40 0.0482 83.44 0.0164 3.00 42.00 0.4010 41.79 0.4050 60.70 0.1272 74.48 0.0437 10.00 24.30 1.179 23.52 1.2430 44.06 0.3550 61.35 0.1217 Table lib Control 2 0.10 0.30 1.00 3.00 10.00 73.29 59.45 42.4O 27.17 15.44 0.0486 0.1345 0.3910 0.9700 02.3100 72.33 58.18 41.10 25.62 13.96 0.0530 0.1530 0.4220 1.0800 2.6500 84.92 75.69 62.22 48.19 34.60 0.0134 0.0390 0.1147 0.2780 0.6180 90.84 85.22 75.71 64.93 52.68 0.0046 0.0129 0.0390 0.0947 0.2120

THE DISPERSION OF PIGMENTS INTO DRY POWDER BASE 475 Reflectance data (average) Table IIc Moritz mixer % Pigment %R4oo K/S4oo R5oo K/S$oo R6oo K/S6oo R7oo K/S7oo 0.10 70.46 0.0620 68.92 0.0700 82.93 0.0175 89.19 0.0066 0.30 57.45 0.1575 56.06 0.1723 74.15 0.0451 84.09 0.0150 1.00 40.26 0.4430 38.36 0.4950 60.26 0.1310 74.27 0.0446 3.00 24.54 1.1600 22.57 1.8300 45.02 0.3350 61.90 0.1173 10.00 14.70 2.4800 13.18 2.8500 32.92 0.6830 50.39 0.2440 Table lid Papenmeier mixer 0.10 0.30 1.00 3.00 10.00 68.77 55.83 39.58 25.50 13.93 0.0710 0.1747 0.4610 1.0880 2.6600 67.29 54.43 38.00 23.82 12.42 0.0795 0.1907 0.5060 1.2200 3.0900 82.02 72.79 59.44 45.79 32.08 0.0197 0.0508 0.1383 0.3210 0.7200 88.7O 83.09 73.60 62.64 49.75 0.0072 0.0172 0.0474 0.1114 0.2540 Table III Reflectance data (average) for 1% pigment levels Wavelength nm R%, Control 1 R•, Control 2 R%,Moritz R%, Papenmeier 400 58.42 42.40 I 40.26 39.58 420 58.40 42.16 ' 39.87 39.28 440 58.61 42.11 I 39.70 39.24 460 58.54 41.87 39.31 38.80 480 57.39 40.13 37.74 37.28 500 58.17 41.10 ' 38.36 38.00 520 • 51.65 36.16 33.63 33.35 540 57.78 40.62 38.07 37.58 560 61.18 45.61 43.20 42.68 580 66.32 52.90 50.60 49.85 600 73.40 62.22 i 60.26 59.44 620 75.72 65.49 63.64 62.86 640 77.51 67.91 66.25 65.46 660 78.88 69.86 i 68.18 67.42 680 81.16 73.11 71.54 70.53 700 83.44 75.71 ' 74.27 73.60 [ *The data at 520 nm are all low, due to a faulty filter in the particular instrument used. INTERPRETATION OF INSTRUMENTAL DATA Three separate methods can be used in assessing the significance of the spectrophotometric data obtained.