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

I suspect that the water you used was not hot enough . I had the same
problem recently - I tried hot water out of the tap but it would not
etch. so I then used boiling water in the right quantity with the sp and
had no problem with etching. The board etched in about 5 mins

Regards

Tony Magon

Sydney Australia

P.O. wrote:

>
> Does anyone use sodium persulfate as etchant?
> I'm makeing my first pcb using toner transfer from kodak-paper. But the
> etchant doesn't work very well.
> I use about 0,8 dl etchant for 4 dl of water@ca 50° in a plastic bowl
> that and moved stirred it pretty much the first hour... The pcb is
> about 4x3 cm big.
> Now it has been in the etchant all night and only about 1/8 of the
> board has etched.
> Maybe the kodak-paper left something on the surface? I did iron it
> about 60 seconds on both sides. To long?
>
> /P.O.
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