Hi, When you heat Cr/Au films above 150c the Cr diffuses through the Au to the surface and turns white (Cr/Au phase oxide). The good news is that there are thickness of Au that the Cr cannot diffuse through in time that you would anneal, so you must try some experiments. Rick Rick Morrison Sr. Semiconductor Engineer Radant Mems Inc. 255 Hudson Road Stow Ma, 01775 Tel- 978-562-3866 Cell 508-801-4796 AMS Phone: 508-770-3521 EMAIL rmorrison@radanttechnologies.com