> > When I make a test for Catalase what percentage of Hydrogen Peroxide >use??? >1%, 2%.... I don't know. 3% H2O2. Karen 8) "It's a very ancient saying, but a true & honest thought, that if you become a teacher, by your pupils you'll be taught." The King & I (Getting To Know You) Karen Kiser MA MT(ASCP) St. Louis, Mo. kkiser6239 at aol.com