Ammonia Persulfate Results

Mixed bag.

It did a pretty good job etching some of the copper/brass like this:

The roughness in the etched portions is do to small bubbles that form. I etch face down so I didn't see what was happening. Cool effect that I may use is another project.

But on the Aaron's belt tip the ammonia was removing the resist after about 30 minutes so I had remove the copper sooner than I wanted to. Hence, a shallow etch.

Then it totally destroyed another etch. Destroyed.

I think this occurred because I wasn't able to hold the ammonia persulfate at the target temperature. So it wasn't a quick etch and gave the ammonia persulfate time to work under the resist. More experiments needed.