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ANSI/TAPPI T 525 om-22
Diffuse brightness of paper, paperboard and pulp (d/0)
This method is to be used to evaluate the diffuse blue reflectance factor (diffuse brightness) of pulp by measuring handsheets prepared according to TAPPI T 218 "Forming Handsheets for Reflectance Tests of Pulp" The meThis method is for the determination of the brightness of white, near-white, and naturally colored pulp, paper, and paperboard. Brightness is a commonly used industry term for the numerical value of the reflectance factor of a sample with respect to blue light of specific spectral and geometric characteristics. This method requires an instrument employing diffuse illumination and 0ø viewing geometry.
Technical Association of the Pulp and Paper Industry [tappi]