Phase stable lead monoxide powders are disclosed in which substantially pure free flowing PbO having a crystal phase which is homogeneous, and which phase may be selected from either the litharge or massicot forms, retains such phase homogeneity over extended periods under ambient storage conditions...http://www.google.com/patents/US5252311?utm_source=gb-gplus-sharePatent US5252311 - Phase stable lead monoxide and process for the production thereof
