BS EN 13523-15:2015
$86.31
Coil coated metals. Test methods – Metamerism
| Published By | Publication Date | Number of Pages |
| BSI | 2015 | 14 |
This part of EN 13523 defines terms of the procedure for determining the metamerism of a colour match of an organic coating on a metallic substrate.
When two colour specimens have identical spectral reflection curves, they are matching under any illuminant irrespective of its spectral characteristics. This is termed a “spectral match”. It is also possible for two colour specimens having different spectral reflection curves to match visually under a given light source but not to match under another light source with different spectral characteristics; such matches are termed “metameric”.
One quantitative description of metamerism is the so-called “ metamerism index”.
The information of the metamerism index is of limited value where Δ E (instrumental colour difference for a given illuminant, see EN 13523-3 ) is > 0,5. The metamerism index is not suited for determining the absolute colour difference or colour constancy of a given specimen at change of illuminant.
The colour difference under the reference illuminant is to be measured in colour coordinates L*, a* and b* (see EN 13523-3 ).
Excluded from this method are organic coatings producing fluorescence and/or which are multicoloured, pearlescent or metallic.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 5 | European foreword |
| 7 | 1 Scope 2 Normative references 3 Terms and definitions 4 Principle |
| 8 | 5 Apparatus 5.1 Spectrophotometer (see EN 13523-3) 6 Sampling 7 Test panels 8 Procedure 8.1 Calibration 8.2 Measurement |
| 9 | 9 Expression of results 10 Precision |
| 10 | 11 Test report |
| 11 | Bibliography |
