Homebrew PCBs

On Mon, 20 Nov 2006 20:06:52 +0100, Dan Pickard <dlpwebmail@...>  
wrote:

>
> 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


Staedtler specifically formulated some inks for laboratory use to mark  
glassware etc.

I think baking helps, but haven't done direct comparisions.

ST