Hey, I found that 45% KOH was ideal for obtaining a decent surface. 85 degrees should be fine. Make sure the stirring rate is high so that the etch byproducts are dispersed. Ashwin Seshadri Graduate research Assistant Material Science Dept. Univ. of Texas at Arlington _________________________________________________________________ MSN Toolbar provides one-click access to Hotmail from any Web page FREE download! http://toolbar.msn.com/go/onm00200413ave/direct/01/