The Chemical Rubber Company (CRC) has a Handbook of Metal Etchants which is very useful. The "Metal" part of the title is unfortuntate because the book includes semiconductors and many compounds. I have found this book to be extremely useful even (like all CRC publications) it is very pricy. best regards mark Mark W. Lund, PhD Director >> Soft X-ray Web page http://www.moxtek.com<< MOXTEK, Inc. 452 West 1260 North Orem UT 84057 801-225-0930 FAX 801-221-1121 lundm@xray.byu.edu "The state is good at simple tasks, like killing people and seizing their wealth. It has far more trouble reaching inside individuals and making them good." Doug Bandow