32 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS Table III. Face powder pass/fail colour experiment Operator Sample No. No. Sex 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Total 1 M x x x 3 2 M x x x x x 5 3 M x x x x x 5 4 M x x x x x x x x 8 5 M x x x x x x x 7 6 M x x x x x x 6 7 M x x x x x x x 7 8 M x x x x x 5 9 M x x x x x x x 7 10 M x x x x x 5 11 M x x x x x x x x 8 12 M x x x x x 5 13 M x x x x x 5 14 M x x x x 4 15 M x x x x x x x x 8 16 M x x x x x x x 7 17 M x x x x x x x 7 18 M x x x x x 5 19 M x x x x x 5 20 M x x x x x x 6 21 M x x 2 22 M x x x x 4 23 M x x x x x x 6 24 M x x x x 4 25 M x x x x x x x x 8 26 M x x x x x x 6 27 M x x x x 4 28 M x x x x 4 29 M x x x x x x 6 30 M x x x x x x x x 8 31 M x x x x 4 32* M x x x x x x x x x x x x 12 33 F x x x x 4 34 F x x x x x 5 35 F x x x x x 5 36 F 0 37 F x x x x x x 6 38 F x x x x x x 6 39 F x x x x x 5 40 F x x x x x 5 41 F x x x x x x x 7 42 F x x x x 4 43 F x x x x x x 6 44 F x x x x 4 x = Fail,

INSTRUMENTAL COLOUR ASSESSMENT 33 Table III continued Operator Sample No. No. Sex 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Total 45 F x 1 46* F x x x x x x x x x x x x x 13 47 F x x x x x x x x 8 48* F x x x x x x x x x x x x 12 49 F x x x x x x x x x 9 50 F x x x x x x x 7 51' F x x x x x x x x x x 10 52 F x x x x 4 53 F x x x x 4 54* F x x x x x x x x x x x x 12 55 F x x x x x 5 56* F x x x x x x x x x x x x x 13 x • Fail. included as an additional test of discriminatory performance. The 56 examiners (who represented a cross-section of laboratory and factory personnel) were asked merely to say whether each sample was a 'satisfactory' match to the standard: in most cases, this was interpreted as 'is there a perceptible difference?' Details of how each sample was obtained from the standard are given in Table IV. Six of the examiners--those marked with an asterisk in Table III--were professional colour discriminators whose full time job routinely involved colour matching. It will be seen that this group were much more strict than the rest. Table IV. Composition of samples used in experi- ment reported in Table III Sample Composition 1 Standard + 20% Extended yellow 2 Standard + 5% Base 3 Standard+ 5% Extended brown 4 Standard + 10% Extended yellow 5 Standard 6 Standard + 10% Extended brown 7 Standard + 10% Base 8 Standard + 5% Extended yellow 9 Standard + 5% Extended red 10 Standard + 20% Extended brown 11 Standard + 10% Extended red 12 Standard + 50ø/0 Extended brown 13 Standard + 20% Base 14 Standard