Homebrew PCBs

On Sat, 28 May 2016 14:53:48 -0400, you wrote:

>Read the MDS. It is pretty safe stuff. About a million years ago I was a 
>Lab Tech and HCl was used to wash ink off our hands.
>Beauty shop peroxide is about 30% and over $30 per gallon. The drug 
>store stuff works and $1 per Qt. I wash all wounds with the $1 peroxide 
>and some people use it for mouth wash.
>It also leaves bleach dot on you clothing.

Several things:

1) I've used ferric chloride, and never again.
2) I already have HCL and peroxide, and use them in a different
fixture.
3) I'm trying to make use of an existing etching system I bought
surplus, it has parts that will be damaged by HCL/Peroxide.
4) I'm finding the cost of the ammonium persulphate rather high.
5) I'm wondering if boosting the oxygen content with perhaps 2 quarts
of 3% and some more concentrated H2O2 would work if I added, say, some
sodium ions (or do I even need to?).
6) I'm looking for an inexpensive substitute for
sodium/potassium/ammonium persulphate that DOES NOT eat my etching
tank.

Harvey