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This Part of EN 13523 sepcifies procedures for determining the instrumental colour difference (CIELAB) of an organic coating on a coil coated metal. Establishing a standard as well as the magnitude of an acceptable colour difference are not covered by this method. Two appropriate 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. Excluded from this method are specimens producing fluorescence, showing significant metamerism, and which are multi-coloured, pearlescent or metallic. In order to determine whether metamerism is present, the metamerism index is determined (see EN 13523-15) and/or a visual examination (see the document in preparation, WI 00139156, Part 22 of this Standard) is performed with different artificial light sources.