>From: "P.O." <ohlson@...>
>Reply-To: Homebrew_PCBs@yahoogroups.com
>To: Homebrew_PCBs@yahoogroups.com
>Subject: [Homebrew_PCBs] Slow etching, Sodium Persulfate?
>Date: Mon, 1 Nov 2004 13:27:14 +0100
>
>
>
>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?
When I've used ammonium persulpate it had to be warm to work properly.
Leon
--
Leon Heller, G1HSM Tel: +44 1424 423947
Email: aqzf13 at dsl dot pipex dot com
WWW:
http://www.geocities.com/leon_heller