M. Parameswaran, et al, did some research on Thermal Radiation Detectors using a CMOS process in the early 90s. They published results in IEEE Circuits and Devices ("High Level CAD Melds Micromachined Devices with Foundaries" - Nov, 1992) and in IEEE Electron Device Letters ("Micromachined Thermal Rad Emitter from a Commercial CMOS Process" - Feb, 1991). In those articles, they claim that EDP will not attack exposed aluminum. I have not found this to be the case from my experience. Can anyone shed some thermally-emitted light on this question? Thanks, Dr. Kevin M. Walsh Electrical Engineering Department, Speed Scientific School University of Louisville, Louisville, KY 40292 (502) 852-0826 Internet address: kmwals01@starbase.spd.louisville.edu