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BS 5477 77th Edition, June 30, 1977
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Method for Visual assessment, by grid assay, of dirt in paper for character recognition
Includes all amendments and changes through Reaffirmation Notice , September 2, 2013
Page Count:8
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Measures the proportion of the surface area containing particles that are immediately obvious to the eye. Reports the number of grid squares per 6 m2 containing dirt.