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

Jim Miller wrote:

> I just read Adam Seychell's page on various etching solutions.
>
> It seems to me that the only disadvantage to ammonium persulfate is slow
> etch speed at room temp.

It needs heating 30 to 70C to get practical etch rates. Its not as
economical as FeCl3 and other chloride based etchants. I guess some
people use it because they like to see the PCB being etched.