ISO 3905:1980 Paints and varnishes; Determination of contrast ratio (opacity) of light coloured paints at a fixed spreading rate (using black and white charts)
1981ISO 3905:1980/Amd 1:1981 Paints and varnishes; determination of contrast ratio (opacity) of light coloured paints at a fixed spreading rate (using black and white charts); amendment 1
1980ISO 3905:1980 Paints and varnishes; Determination of contrast ratio (opacity) of light coloured paints at a fixed spreading rate (using black and white charts)