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Viewing picture 8 of 21   (file: pickeymatrixpcb20030705779.jpg)

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The component side while etching (thus the blue-ish color)
Since I etched the solder-side and the component side seperately, I came up with a simple way of prohibiting the etchant reaching the other side of the board: clear tape (similar to scotch tape of Tesafilm :), but a wider variant.
I also used a long strip of that tape to make a 'holder' to move the board in the etchant.
 
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