Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

I had thought I might experience 'drag' causing the plot(scratch) to
be erratic so I had decided to get an etch resist pen in ready for
when it comes, I found that I can buy (WHS uk) sharpie's but only in
blue or black, or a twin pack of black and red.

I bought a blue and a black.

I have seen advertised that a staedtler lumocolor (permanent) will
work, but could not find one.


I've had no luck with any Sharpie. The lumicolor pen you speek of is the best one I've ever used. It has superior holding strength in acid - but still fails (lifts off pcb) at the end of the etching process before all copper is removed. I haven't tried the lumicolor in FC yet, only sodium persulfate. I felt it would hold up better in persulfate but etching time is increased so it could be a draw(no pun). I'm also going to try the lumicolor in muratic/peroxide acid soon. I've never tried baking the lumicolor before etching. I feel it could help...
Dan


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