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

M&G lists sodium persulfate as an alternative to FeCl. Anyone tried
it? I've already read the archives and haven't seen any actual use.
Most alternative etchant use seems to have been ammonium persulfate
which although clear and allows viewing the etch progress apparently
is difficult to store over time...especially in plastic.

How difficult is sodium persulfate?

tnx
jtm