Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

"H2O2 can degrade with temperature and time."

- I wondered about that shelf life thing, but didn't know if my acid was the one that had gone bad. The past few etches have turned out OK, but seemed to take forever. When I first got attached to that method I was really impressed by how fast it worked and how forgiving it was about conditions and agitation. I remember etching outside in the late fall or winter (I think it was even rainy) and it would burn away so fast that I had to rip it out of the solution after a couple minutes or it would eat through the thinner traces.

I need to get that going again. I'll probably start with all new chemicals and if that doesn't do it, I'll track down the stronger H2O2 you guys are talking about.

George