Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, DJ Delorie <dj@...> wrote:
>
> FeCl would normally be a light or dark tan color.  Black or green means 
> it's spent.  The cheapest thing to try is to add some hydrogen peroxide 
> to it, which will convert some or all of the dissolved copper into a 
> cupric chloride etchant (emerald green).  If that doesn't work, you'll 
> have to add some hydrochloric acid, effectively making an acid/peroxide 
> etchant that happens to have some spent FeCl in it.
> 
> I've used old etchant that wasn't spent and it works just fine; it's not 
> the age that counts it's how much you've used it.
>

FeCl also works best Heated.  I would really recommend the Cupric Cholride, it works great.  I use to use FeCl but now that I use Cupric Cholride I'll never use FeCl again.  Cupric Cholride also does great just at room temp. so no heating.

Ben