Wouter,
On Sun, 7 May 2006 14:56:23 +0200, Wouter van Ooijen wrote:

> I want to give PCBs a serial number (for visual inspection only). I
> could write the number with a marker pen, or use a printed sticker, but
> I am afraid such markings won't last for too long.
> 
> Do any of you have experience with using scratch-away markings using the
> silk or component-copper layer? Or maybe solder pads that are soldered
> to make the marking? I have a small area available on the component
> side, maybe I can even get rid of all copper there, but I can't free the
> solder side.

I've seen patterns in the copper in seven-segment format, where the solder-resist is scratched away from the 
appropriate segments to reveal the copper underneath.  It looked good, but I can't say how easy it would be to 
do it.

Cheers,


Howard Winter
St.Albans, England


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