Hey, Freckle or sometimes although named De-Freckle Etch is a mixture of: Nitric Acid and Ammoniafluoride. I can give you some typical compositions: 70 Parts per Volume HNO3 69% 1-5 Parts per Volume NH4F solution 40% 25-29 Parts DI-Water that's it! Armin ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com