scope:

This part of ISO 10545 describes methods for utilizing colour measuring instruments:

- for quantifying the small colour differences between plain coloured ceramic tiles, which are designed to be of uniform and consistent colour. It permits the specification of a maximum acceptable value which depends only on the closeness of match and not on the nature of the colour difference;

NOTE 1 Colour variations produced for artistic purposes are not covered in this part of ISO 10545.

NOTE 2 This test should only be used when small colour differences between plain coloured tiles are important in a specification or by agreement.

- for determining the Light Reflectance Value (LRV) of ceramic tiles. The method of test is applicable to tiles that have multi-coloured surfaces including those that cause extreme angular dependences of reflected light and those that have a surface texture of < 2 mm.