Homebrew PCBs

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
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