Clear liquids - Estimation of colour by the Gardner colour scale - Part 2: Spectrophotometric method (ISO 4630-2:2004); German version EN ISO 4630-2:2004— 11 стр.
Clear liquids - Estimation of colour by the platinum-cobalt scale - Part 2: Spectrophotometric method (ISO 6271-2:2004); German version EN ISO 6271-2:2004— 9 стр.