Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

Thanks!!

It’s interesting how different combinations of the three components changes the way the etch process happens.  If I go lighter on salt and more peroxide the etchant turns a deep green and there’s lots of flecks (precipitate?).  If I let that sit after using it, it turns blue.

More salt generates more fizz and seems to keep the etchant blue, but does nothing to improve speed.

More vinegar seems to do nothing at all. 

It seems like if I keep adding copper and a bit of peroxide I can keep the reaction going for a long time.. but when it stops it doesn’t seem able to be revived.