Homebrew PCBs

> I found cupric chloride to be very slow at room temp, it benefits from heating even more than FeCl. HCl + peroxide certainly works fine at room temp though, until enough of it converts.
>

I have never heated mine before.  In fact I have it on the back porch and have etched boards fine in cold weather.  I just pump lots of air into it.  Sometimes add a little HCl if it seems to be slower than normal.  I kept it covered when not in use but can still vent.  So times will leave it uncovered to reduce it down some.  I normally don't add any peroxide.

Ben