Under natural convection cooling, I know black anodized aluminum dissipates heat more efficiently than unfinished aluminum due to radiation. Recently, I was told that other colored anodizing, and even clear anodizing, dissipate as good as black. The explanation was that the spectral emissivity of aluminum oxide, whether colored or not, is equally high in the infra-red range. Is it true that black and clear anodizing make no difference? Thanks, K.K. Chin Artesyn Technologies Fremont, CA ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################