Homebrew PCBs

On Mon, 24 Jul 2006 23:58:31 +0200, fenrir_co <fenrir@...>  
wrote:

>
> Maybe it's too acidic? I tried the HCl + H2O2 mixture once, and made
> it too strong, it ate right through the toner and the permanent marker
> I had used to touch it up.


Yes, you are right, if the HCl molarity is high it is much more agressive,  
especially to markers (which are ink as well!).
But i do not think it is - i have not added HCl for quite a while and i  
expect it to be at the low end. I will measure the molarity tomorrow -  
haven't done that for ages...

Anyone know what the lowest practical HCl molarity is one can run CuCl at?

ST