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ANSI/TAPPI T 529 om-25
Surface pH measurement of paper
This non-destructive test may be used to measure the hydrogen ion concentration (pH) on the surface of the paper in books and documents that constitute the collections of libraries and government archives. This method serves as an alternative to TAPPI T 509 "Hydrogen Ion Concentration (pH) of Paper Extracts - Cold Extraction Method," and TAPPI T 435 "Hydrogen Ion Concentration (pH) of Paper Extracts - Hot Extraction Method," because it avoids the destruction of printed material in the determination of the permanence expected for paper (see also 11.2).
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Technical Association of the Pulp and Paper Industry [tappi]