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From: Don Pearce
Subject: Re: Etching!
Date: Fri, 18 Oct 2002 12:12:41 +0430
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On Fri, 18 Oct 2002 10:34:44 +0300, "Märt Pikkani"
>I don't know if this is rihgt newsgroup to get my answer but i will try. If
>not, then could anyone recomend me a newsgroup from where i could get
>Here is what i did.
>I printed out my PCB on to a tranparency. Then used money detector as UV
>light an got tracks onto board. With NaOH (developer fluid) the tracks
>became clear and visible.
>Then used Fe3Cl to etch the Cu around the tracks.
>tracks are still with clear and visible but Problem is that Cu around the
>tracks changes its color( like Pink) but doesn't leave the PCB clear.
>Meaning that all the plate is still covered with Cu but little Cu has left
>the PCB. I could feel the edge of the track with my finger.
>What is my problem?
>is it money detector (UV ligth), which I don't believe.
>Do I do something wrong?
>Is it problem of etching bouder?
The etching simply has not completed. You need to
a. heat the etching fluid
b. agitate the tank while etching so you don't get a layer of
exhausted etchant in permanent contact with the board.
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