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ONORM EN ISO 3668:2020
Paints and varnishes - Visual comparison of colour of paints (ISO 3668:2017)
This document lays down a method for visually sampling the color of coatings against a standard (either a reference standard or a freshly produced standard) under artificial light sources in a color sampling booth. It is not applicable to coatings containing special effect pigments, such as metal effect pigments, unless all the details of the lighting and observation conditions have been agreed in advance.
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Austrian Standards Institute [on]