Coil coated metals. Test methods - Colour difference. Instrumental comparison
Coil coated metals. Test methods - Colour difference. Instrumental comparison
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1 Scope This part of EN 13523 specifies procedures for determining the instrumental colour difference (CIELAB) of an organic coating on a metallic substrate. Establishing a standard as well as the magnitude of an acceptable colour difference are not covered by this method. Two methods are given in this part of EN 13523:
a) instrumental colour difference measurement using a tristimulus colorimeter;
b) instrumental colour difference measurement using a spectrophotometer or equivalent.
Care should be taken when measuring e.g.
— textured surfaces;
— fluorescent coatings;
— metameric coatings;
— multi-coloured, pearlescent, metallic or special colour effect coatings.
In order to determine whether metamerism is present, the metamerism index is determined (see EN 13523‑15) and/or a visual examination (see EN 1352...
Упомянутые в описании и другие стандарты BS