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From: "Leon Heller"
Subject: Re: Etching!
Date: Fri, 18 Oct 2002 12:22:21 +0100
NNTP-Posting-Date: 18 Oct 2002 12:13:40 GMT
X-Newsreader: Microsoft Outlook Express 5.50.4920.2300
"Märt Pikkani" wrote in message
> I don't know if this is rihgt newsgroup to get my answer but i will try.
> 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?
As others have said, the etching is probably incomplete, rather than a
problem with the UV exposure or development.
The FeCl3 needs to be hot, about 50C. I warm it in the microwave, and then
put the etchant container in a larger container filled with hot water. I
also rock the etchant container continuously (wearing rubber gloves). With
fresh etchant, it takes about 5 minutes to get complete removal of the
Leon Heller, G1HSM
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