Over deze norm
This International Standard specifies a method for estimating, by means of the Gardner colour scale, the colour of clear, yellow/brown, liquid products using colour measuring instruments. The results may be invalid if other products are used. The test uses the Gardner colour scale described in ISO 4630-1. The method is applicable to drying oils, varnishes and solutions of fatty acids, polymerized fatty acids, resins, tall oil, tall oil fatty acids, rosin, and related products. The method descibed provides a more precise way of measuring Gardner colour than described in ISO 4630-1. It is applicable to products having colours from Gardner 1 to Gardner 18. The Gardner scale is not applicable to products with colours lighter than 1 or darker than 18.