The present invention refers to a cosmetic powder whose coating includes polymers or co-polymer belonging to the Poly Alpha Hydroxi Acids family, to a cosmetic composition that contains it and to the process of preparation of the powder. The defect inspecting apparatus, which has a plurality of configuration units and inspects defects on the surface of a sample, is provided with a means for monitoring time-dependent changes and failures of some of or all of the configuration units, and a means for notifying the user of the results of the monitoring. The fluid-bed catalyst is a composition of the chemical formula Mo1.