the receptacle is then placed under an incident light beam corresponding to the light of day the light reflected by the sample is detected through three colour filters the instrument displays the mean value of three successive measurements performed automatically three flashes the result is expressed in components l a b the results are set out in tables a and b below table a______________________________________ roasted hazelnutssample no l a b______________________________________1 22 34 2 21 2 622 24 90 1 65 3 263 22 14 2 27 2 534 22 24 2 28 2 665 22 30 2 20 2 706 24 97 1 90 3 317 24 82 1 53 3 108 24 67 1 69 3 16average 23 55 1 97 2 92standard deviation 1 30 0 29 0 30______________________________________ table b______________________________________ toasted hazelnutssample no l a b______________________________________1 49 74 8 20 25 832 48 84 8 36 26 173 49 82 8 12 26 134 50 31 8 22 26 425 48 06 8 74 26 026 49 90 8 00 26 527 49 07 8 38 26 318 48 25 8 44 26 00average 49 25 8 31 26 18standard deviation 0 77 0 21 0 22______________________________________ three flavouring products are prepared by mixing the roasted and ground hazelnuts a of example i and the toasted and ground hazelnuts b of example i in three different ratios by weight namely mixture i is distinguished.