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

----- Original Message -----
From: "Jim Miller" <jim@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Thursday, December 04, 2008 3:16 AM
Subject: [Homebrew_PCBs] Ammonium Persulfate disadvantages?


>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.
>
> Does this result in a poor etch control? Poor etch definition? Other
> problems?
>
> Since my use is for hobby purposes only I'm not sure why slow speed is a
> problem.
>
> Does anyone have any experience with ammonium persulfate that can give
> some
> insight?

Continuous agitation will be very tedious if doing it by hand. You might get
a lot of undercutting. It doesn't keep very long when made up, unlike FeCl3.

Leon