1、CEN EN*28654 92 W 3404589 O040826 235 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 28654 December 1992 UDC 671.1 : 669.215 535.64 62-777 Descriptors: Jewels, gold alloys, colours, designation, chemical composition English version Colours of gold alloys - Definition, range of colours and desi
2、gnation (IS0 8654 : 1987) Couleurs des alliages dor - Dfinition, gamme de couleurs et dsignation (IS0 8654 : 1987) Farben von Goldlegierungen - Bestimmung, Farbenreihe und Bezeichnung (IS0 8654 : 1987) This European Standard was approved by CEN on 1992-12-01. CEN members are bound to comply with the
3、 CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariait o
4、r to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official vers
5、ions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisa
6、tion Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B- 1050 Brussels O 1992 Copyright reserved to CEN members Ref. No. EN 28654 : 1992 E CEN EN*Z8654 92 M 3404589 0040827 171 Page 2 EN 28654 : 1992 Foreword This European Standard is the endorsement of IS0 8654. Endorsement o
7、f IS0 8654 was recommended by Qchnical Committee CEN/TC 283 Precious metals - Applications in jewelery and associated products under whose competence this European Standard will henceforth fall. This European Standard shall be given the status of a national standard, either by publication of an iden
8、tical text or by endorsement, at the latest by June 1993, and conflicting national standards shal be withdrawn at the latest by June 1993. The standard was approved and in accordance with the CENKENELEC Internal Regulations, the following countries are bound to implement this European Standard: Aust
9、ria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. CEN EN*28b54 92 = 3404589 0040828 O019 = Page 3 EN 28654 : 1992 Colours of gold alloys - Definition, range of colours and designati
10、on O Introduction In the manufacture and sale of articles made of or coated with gold alloy, the colour of the surface of the product is an impor- tant characteristic. However, at present, an undue variety of colours of surface finishes is offered to the public. Some of these colours differ only sli
11、ghtly from one another. The range of colours defined in this International Standard is in- tended to enable the manufacturer to limit the stock of different colours that he might be obliged to keep. It will also enable the purchaser to define his requirements with precision by referring to the desig
12、nations given within this International Standard and so avoid the need for purchasing orders to be accompanied by colour samples. 1 This International Standard specifies a limited number of colours of gold alloys. Scope and field of application By specifying a range of gold alloy colours, this Inter
13、national Standard enables a corresponding range of polished gold colour slips to be produced for comparison purposes for use in routine transactions between manufacturer and purchaser. It applies to jewellev, and to watch cases and accessories made of gold alloys or watch cases and accessories with
14、gold alloy coverings. 2 References CIE Publication No. 15, Colorimetry. CIE Publication No. 38, Radiometric and photometric charac- teristics of materials and their measurement. 3 Definition colour of gold alloy: A three-dimensional colour space represented by the chromaticity Co-ordinates x and y a
15、nd reflectance e, in accordance with CIE Publication No. 15. NOTE - When necessary for special purposes or in the field of national standardization, the chrornaticity Co-ordinates may be con- verted to other internationally or nationally agreed systems (e.g. CIE 1976 L*u*b* colour space or C:IE 1976
16、 L*u*v* colour space). 4 Range of colours anid designation The range of colours accordivtg to chromaticity co-ordinates are given in table 1. 5 Measurement method 5.1 Preparation of the samples The samples to be measured shall have a polished surface. The finishing shall be continued until a constan
17、t reflectance grade has been achieved. 5.2 Apparatus 5.2.1 Integrating sphere spectrophotometer. 5.2.2 Standard illuminant, comprising a light source yielding the spectral distributioin similar to that of the standard light source O 65 (daylight) specified in CIE Publication No. 15. 5.3 Test procedu
18、re Measure the spectral reflectance in accordance with CIE Publication No. 38. 6 Colour slips For comparison purposes in routine transactions, it is recom- mended that a range of polished gold alloy colour slips should be used that are prepared so that the colour of the surface of each colour slip a
19、ccords with the chromaticity Co-ordinates given in table 1 when measured in accordance with clause 5. See the annex for the recommended chemical composition of colour slips. Colour designation ON (yellow-green) 1N (pale yellowl 2N (light yellow) 3N (yellow) 4N (Dink) 5N (redi Table 1 X 0,338 3 0,352
20、 6 0,359 O 0,360 1 0,361 2 0,359 1 ominal vali Y 0,366 2 0,370 O 0,376 6 0,372 9 0.365 9 0,360 4 Chromaticit e 0.90 0.82 0.82 0,79 0.76 0,74 :o-ordinates CEN ENs28654 92 3404589 0040829 T44 Page 4 EN 28654 : 1992 X 0,334 5 0,340 4 0.345 6 0.338 6 0.348 6 0.352 7 0,355 7 0,351 3 0,355 8 0,360 o 0,363
21、 5 0,359 O 0,357 8 0,362 3 0.366 3 0,361 4 0,357 7 0.362 6 0,366 3 0,361 O 0,355 5 0,362 1 0,366 O 0,358 9 Tolerances Y 0,364 4 0,374 O 0,372 5 0,363 3 0,368 5 0.373 O 0,371 7 0,367 4 0,376 4 0,381 o 0,379 5 0.375 O 0,372 4 0,376 7 0,374 8 0,370 7 0,366 0 0,370 1 0,368 2 0,364 4 0,359 1 0,363 8 0,36
22、1 6 0,357 2 e 0.90 0.82 +0,01 - 0,m 0.82 :$: 0.79 :% 0.76 0.74 :$i CEN ENr28654 92 D 3404589 0040830 766 ON IN 2N 3N 4N 5N Page 5 EN 28654 : 1992 585 300 to 340 585 240 to 265 I5O to 160 Balance 750 120 to 130 750 45 to 55 350 1 85to 95 Annex Recommended chemical composition of colour slips (This an
23、nex does not form an integral part of the standard.) For information purposes only, approximate values for the chemical composition of relevant gold alloys which are recommended for preparing the colour slips are given in table 2. NOTES 1 surface of a gold alloy is also dependent upon its surface fi
24、nish and metallurgical condition. 2 It is not possible to define the colour of a colour slip by reference to the chemical composition alone of the alloy used because the colour of the In making visual comparisons between samples and reference colour slips, the surfaces should be viewed tlirough translucent paper. Table 2 Chemical composition %o I Au I Ag Colour designation I
