This standard specifies a method for testing the opacity of paper and paperboard (paper backing) using diffused illumination/O° reception. This standard applies to white or near-white paper and paperboard.
JIS P 8149:2000 history
2023JIS P 8149:2023 Paper and board -- Determination of opacity (paper backing) -- Diffuse reflectance method
2000JIS P 8149:2000 Paper and board -- Determination of opacity (paper backing) -- Diffuse reflectance method