Homebrew PCBs

Just to have one post today on the subject. Are there any new 
results?

I did come across this during a discussion on another group:

Sodium Persulfate is a good replacement for Ammonium Persulfate for 
its compatibility with etch resist pens. Sodium Persulfate will not 
remove etch resist ink and like Ammonium Persulfate crystals, are 
used as an alternative to the traditional ferric chloride to produce 
a cleaner copper etchant solution.

Here's the link:


http://www.mgchemicals.com/products/4101.html


Something to be considered down the line. I did notice how fragile 
the Durabrite ink ws in both FeCL and HCl/H2O2 etches. I did not try 
Ammonium Persulfate.

Myc