This monograph for Lead Monoxide provides, in addition to common physical constants, a general description including typical appearance, applications, change in state (approximate), and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, Insoluble in Dilute Acetic Acid, Chloride, Nitrate, Calcium, Copper, Iron, Potassium, Silver, and Sodium.