Homebrew_PCBs

--- In Homebrew_PCBs@yahoogroups.com, Les Newell <lesnewell@f...>
wrote:

> Thanks Adam,
>
> Sounds like my solution is quite low in copper. If I had realised

this I

> would have used less acid and made up less etchant. I bought 250g

of

> copper (II) oxide and based my calcs on the information I found

here:

> http://www.pacificsun.ca/~robert/pcb/cucl.htm
> Never mind, the copper level will build up by itself so it does not
> really matter. This is only hobby stuff so an extra 5 minutes or so
> makes no difference anyway.
>
> Les
>
>
> >You can put more copper oxide to increase etch rate. From memory
> >I think its around 140 g/L of copper(II) ions is good

concentration.

> >What copper oxide did you get, the black stuff or red ?
> >Black is more common which is copper(II) oxide.
> >100 g copper(II) oxide (black) = 66g copper
> >100 g copper(I) oxide (red) = 89g copper
> >

got a question
is it attack only copper or also tin (tin as resist after patern
plating)

gr. Roel