GB/T 36425-2018Watch-cases and accessories—Colour range and designations of gold alloy coverings (English PDF)
表壳体及其附件 金合金覆盖层的颜色范围和名称
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
June 7, 2018
Implementation date
January 1, 2019
Scope
GB/T 36425-2018 is the English-translated version of 表壳体及其附件 金合金覆盖层的颜色范围和名称.
GB/T 36425-2018 defines the colour range and the colour names of the gold alloy coverings used on watch cases and their accessories. It also sets out how the colour of a covering is checked, both by measuring its chromaticity coordinates and by visual comparison.
Its terms, largely taken from GB/T 5698-2001 on colour terminology, include spectral tristimulus values, the CIE 1931 XYZ colour system and chromaticity coordinates, and it relies on QB/T 1901.1 for the general requirements of gold coverings.
It applies to the gold alloy coverings of watch cases and their accessories. It was issued on 7 June 2018 and has applied since 1 January 2019.
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Document preview — GB/T 36425-2018
National Standard of the People's Republic of China
- ICS
- 39.040.10
- Classification
- Y 11
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
1 Scope
This standard specifies the color range and name of the gold alloy cover of the watch case and its accessories, the measurement method and visual ratio of the chromaticity coordinates. Color method.
This standard applies to the case shell and its accessories gold alloy cover.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 5698-2001 color terminology
QB/T 1901.1 Gold-clad coverings and their accessories - Part 1. General requirements
3 Terms and definitions
The following terms and definitions as defined in GB/T 5698-2001 and QB/T 1901.1 apply to this document. For ease of use, Some terms and definitions in GB/T 5698-2001 are listed repeatedly.
3.1 Spectral tristimulus value
In a three-color system, a tristimulus value that is capable of monochromatic radiation.
Note: It is represented by x(lambda), y(lambda), z(lambda) in the XYZ color system of CIE (International Commission on Illumination). [GB/T 5698-2001, definition 4.27]
3.2 XYZ color system
A three-color system based on the spectral tristimulus values x(lambda), y(lambda), z(lambda) specified in CIE 1931. [GB/T 5698-2001, definition 4.34]
3.3 Chromaticity coordinate
The ratio of each tristimulus value to their sum.
In the XYZ chromaticity system, the chromaticity coordinates x, y, and z can be calculated from the tristimulus values X, Y, and Z.
Note: Rewrite GB/T 5698-2001, definition 4.39.
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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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