1、April 2017 English price group 7No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 87.060.10!%c|=“2648926www.din.deDIN
2、 ISO 18314-3Analytical colorimetry Part 3: Special indices (ISO 183143:2015),English translation of DIN ISO 18314-3:2017-04Analytische Farbmessung Teil 3: Spezielle Indices (ISO 183143:2015),Englische bersetzung von DIN ISO 18314-3:2017-04Analyse colorimtrique Partie 3: Indices spciaux (ISO 183143:2
3、015),Traduction anglaise de DIN ISO 18314-3:2017-04www.beuth.deDocument comprises 9 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.04.17 A comma is used as the decimal marker. Contents National foreword 31 Scope . 42 Symbols a
4、nd abbreviated terms . 43 Whiteness index 53.1 CIE whiteness index 54 Yellowness index 55 Black values . 55.1 Black value, MY.55.2 Colour depending black value, MC.5.3 Absolute contribution of hue, dM 5.4 Relative black value, Myr .6 Grey values 66.1 Grey value, GY6.2 Colour depending grey value, GC
5、6.3 Absolute contribution of hue, dG 6.4 Relative grey value, Gyr . 67 Flop-index 7Annex A (informative) Considerations regarding black values 8Bibliography 9Page5556666DIN ISO 18314-3:2017-04 2 National foreword This document has been prepared by Technical Committee ISO/TC 256 “Pigments, dyestuffs
6、and extenders” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was DIN-Normenausschuss Pigmente und Fllstoffe (DIN Standards Committee Pigments and Extenders), Working Committee NA 078-00-03 AA “General test methods for colorants and extenders”. Attention is draw
7、n to the possibility that some of the elements of this document may be the subject of patent rights. DIN and/or DKE shall not be held responsible for identifying any or all such patent rights. DIN EN ISO 18314 consists of the following parts, under the general title Analytical colorimetry: Part 1: P
8、ractical colour measurement Part 2: Saunderson correction, solutions of the Kubelka-Munk equation, tinting strength, hiding power Part 3: Special indices DIN ISO 18314-3:2017-04 3 Analytical colorimetry Part 3: Special indices1 ScopeThis part of ISO 18314 specifies different methods of calculating s
9、pecial indices, which are generally used to describe lightness respectively jetness of samples including chroma or hue within one colour-coordinate.This part of ISO 18314 is applicable to tristimulus values and chromaticity coordinates calculated using colour-matching functions of the CIE 1964 stand
10、ard colourimetric system. It can be used for the specification of colour stimuli perceived as belonging to a reflecting or transmitting object, where a one-dimensional value is required.2 Symbols and abbreviated termsa, b absolute parametersFI flop-indexGCcolour depending grey valueGYgrey valueGyr r
11、elative grey valueGY(GS) grey value of a virtual general standardGY(GSf) fixed mean value (of 10 preparations) of the actual general standardGY(GSv) grey value of the actual prepared general standardGY(Sample) grey value of the sampleL* () CIELab-76 lightness value at the aspecular angle MCcolour de
12、pending black valueMYblack valueMyr relative black valueMY(GS) black value of a defined virtual general standardMY(GSf) fixed mean value (of 10 preparations) of the actual group standardMY(GSv) black value of the actual prepared group standardMY(Sample) black value of the sampleWCIEis the CIE whiten
13、ess indexX, Y, Z tristimulus values of a test stimulusDIN ISO 18314-3:2017-04 4 Xn, Yn, Zntristimulus values of a specific white colour stimulusx, y chromaticity coordinates of a test stimulusxn, ynchromaticity coordinates of a specific white colour stimulusYI yellowness index3 Whiteness index3.1 CI
14、E whiteness indexWY xx yyCIE=+ +800 1700() ()nn(1)This formula is valid within the range of 40 WCIE 5Y 280.NOTE This formula follows CIE 15:2004 and ASTM E 31310.4 Yellowness indexYIaX bZY=100 (2)The absolute parameters a and b depend on illuminant D65 and the standard observer 2 and 10. See Table 1
15、.Table 1 Parameters a and b for standard observer 2 and 10Standard observer a b2 1,298 5 1,133 510 1,301 3 1,149 8NOTE This equation follows ASTM E 31310 and DIN 6167.5 Black values5.1 Black value, MYMYYY=100 logn(3)NOTE This equation follows DIN 55979.5.2 Colour depending black value, MCMXXZZYYC= +
16、100 loglog lognnn(4)NOTE Black value, MC, describes higher jetness if there is a blue shade and lower jetness if the shade is brown.5.3 Absolute contribution of hue, dMdMM-MCY= (5)DIN ISO 18314-3:2017-04 5 NOTE dM describes the amount of blue shade in case of positive values and the amount of brown
17、shade in case of negative values.5.4 Relative black value, MyrMyr%MM()M(GS)M ()%YYfYYv=(Sample) GSGS100 (6)In case of carbon black pigments, a group standard can be defined as a general standard relating to the class of carbon black pigment. See Table 2.Table 2 Virtual black values MY(GS) for group
18、standardsGroup standards (GS) Virtual black value MY(GS)Gas black, powder, and beads 260Oxidized gas black, powder, and beads 250Furnace black, powder, and beads 255Oxidized furnace black, powder, and beads 225Lamp black, powder, and beads 205Thermal black, powder, and beads 205Acetylene black, powd
19、er, and beads 2506 Grey values6.1 Grey value, GYGYYYn=100 log (7)6.2 Colour depending grey value, GCGXXZZYYCnnn= +100 loglog log (8)6.3 Absolute contribution of hue, dGdG G-GCY= (9)NOTE dG describes the amount of blue shade in case of positive values and the amount of brown shade in case of negative
20、 values.6.4 Relative grey value, GyrGyr %GG()G( )G ()%YYfYYv=(Sample) GSGS GS100 (10)In case of carbon black pigments, a group standard can be defined as a general standard relating to the class of carbon black pigment. See Table 3.DIN ISO 18314-3:2017-04 6 Table 3 Virtual grey values GY(GS) for gro
21、up standardsGroup standards (GS) Virtual grey value GY(GS)Gas black, powder, and beads 95Oxidized gas black, powder, and beads 99Furnace black, powder, and beads 99Oxidized furnace black, powder, and beads 85Lamp black, powder, and beads 64Thermal black, powder, and beads 50Acetylene black, powder,
22、and beads 857 Flop-indexThe flop-index (FI) is a special measure to characterize the angular variation of lightness of almost neutral metallic colour shades. Its formal definition isFILLL=()()()269131112086,*,(11)The parameters (exponents, pre-factor) have been chosen in a way so that for convention
23、al metallic pigments the order of magnitude is FI 10. L*() denotes the CIELab-76 lightness value at the aspecular angle with 1=15, 2=45, 3=110.NOTE This formula has been developed by D. H. Alman.1DIN ISO 18314-3:2017-04 7 Annex A (informative) Considerations regarding black valuesThe impression of h
24、ue or colour intensity is a subjective sensory perception. Consequently, differentiation between jet-black paints is not totally without problems. A visual assessment is always significantly influenced by the ambient conditions and by the physical and mental state of the observer. For reliable deter
25、mination, measurement equipment is required which provides reproducible results for the measurement range with minimum reflections.Metrological assessment of the jetness is preferably performed using a spectral photometer with 45/0 (or 0/45) geometry. Here the specimen is placed at an angle of 45 an
26、d generally subjected to circular illumination. The light reflected by the specimen is measured at an angle of 0. The spectrophotometer might be selected in testing of calibration repeatability. The difference of standard value Y has to be lower than 0,003 in the jetness area of Y = 0,04 until Y = 0
27、,05.The visual evaluation is influenced to a great extent by the ambient conditions and by the physical and mental state of the observer. It is consequently necessary to define and observe certain boundary conditions. As natural daylight is subject to continuous fluctuations, a standardised artifici
28、al light source has to be used that produces a light similar to that of daylight type D65 by filtering.The observation angle has to correspond to the 45/0 (or 0/45) geometry of the measuring instrument. As the light falls perpendicularly onto the paint coating, the observer views the specimen at an
29、angle of 45. The area around the specimens should be kept neutral. Reflections of other objects have to be avoided. Matt black specimen mountings and backgrounds and complete darkening of the examination room are of benefit for the evaluation of deep black specimens.DIN ISO 18314-3:2017-04 8 Bibliog
30、raphy1 Alman D.H. Directional color measurement of metallic flake finishes, Proc. ISCC Williamsburg Conf. on Appearance, 53 ( 1987)2 CIE 15:2004, Colorimetry, 3rd edition, ISBN 3 901 906 33 91)3 ASTM E 313-10, Standard Practice for Calculating Yellowness and Whiteness Indices from Instrumentally Mea
31、sured Color Coordinates4 DIN 6167:1980-01, Description of yellowness of near-white or near-colourless materials5 DIN 55979:1989-04, Testing of pigments; Determination of the black value of carbon black pigments1) Available from CIE (International commission on illumination): CIE Central Bureau, Kegelgasse 27, A-1030 Vienna, Austria; www.cie.co.atDIN ISO 18314-3:2017-04 9
