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This method is intended to measure "Opacity -- paper backing," formerly known as "Printing Opacity," and "Opacity -- white backing," formerly known as "Contrast Ratio." It may be used for coloured paper provided that the reflectance (paper backing) is greater than 20% and simultaneously the opacity (paper backing) is greater than 45%. It is not intended for highly transparent papers such as glassine.

The testing and evaluation of a product against this method may require the use of materials and/or equipment that could be hazardous. This document does not purport to address all the safety aspects associated with its use. Anyone using this method has the responsibility to consult the appropriate authorities and to establish appropriate health and safety practices in conjunction with any existing applicable regulatory requirements prior to its use.