Litmus Paper, Neutral

This article is compiled based on the United States Pharmacopeia (USP) – 2025 Edition

Issued and maintained by the United States Pharmacopeial Convention (USP)

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—Usually about 6 x 50 mm in size. Neutral litmus paper meets the requirements of the tests for Phosphate, Residue on Ignition, and Sensitiveness under Litmus Paper, Blue. It changes from its original color to red in acid conditions, and from its original color to blue in basic conditions._{(USP 1-Aug-2019)}