Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, Alan King <alan@n...> wrote:

> 
>   Following this idea, I'd be strongly inclined to forget coating 
and 
> removing, reverse the polarity, and work on point plating the tin 
to the 
> copper..
> 
>   Used to use a 12V supply, clip one side to a thin piece of steel, 
the 
> other side onto a pencil lead from a mechanical pencil, and draw 
fairly 
> permanent lines on the steel with the charged lead.  In fact may 
have to 
> try this myself today, just skip the tin and draw lines on copper 
with 
> pencil lead, should be a good enough resist and I'd imagine the 
copper 
> would work ok in place of the steel..
> 
>   I should've thought to try this before, I used to do this all the 
time 
> writing things on small scrap steel pieces just because it's fun to 
see 
> the sparking and results..
> 
> Alan


Wouldn't point tinning take forever by electrolysis?

Would the graphite be dense enough to act as an etch resist? Would be 
interested in your test results.

Roger