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ISO 22891:2007 Paper - Determination of transmittance by diffuse reflectance measurement
standard by International Organization for Standardization, 07/01/2007
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ISO 22891:2007 specifies a method for the calculation of transmittance based upon diffuse reflectance measurements.
The use of the method is restricted to white and near-white translucent papers. If it is necessary to determine the transmittance of papers which contain fluorescent whitening agents, the fluorescence emission is eliminated using the prescribed UV cut-off filter.