Färg och lack - Visuell jämförelse av färgkulörer (ISO 3668:1998)
This International Standard is one of a series of standards dealing with the sampling and testing of paints, varnishes
and related products.
It specifies a method for the visual comparison of the colour of films of paints or related products against a standard (either a reference standard or a freshly prepared standard) using either natural daylight or artificial light sources in a standard booth.
It is not applicable to coatings containing special-effect pigments, e.g. metallics, without previous agreement on all details of illuminating and viewing conditions.