Historical
ISO 6271-1:2004
Clear liquids - Estimation of colour by the platinum-cobalt scale - Part 1: Visual method
ISO 6271-1:2004 specifies a method for estimating the colour, in Pt-Co units, of clear liquids.
It is applicable to clear liquids having colour characteristics similar to those of the reference platinum-cobalt scale.
International Organization for Standardization [iso]