Homebrew PCBs

Thanks for your comments. It's good to know that people on here are interested in more than just how to do toner transfer.

I think the ziplock bag would have had minimal attenuation. Whilst there was a little air in it, it was above the waterline of the bath. I suspect the rigid plastic container would have attenuated more. The cleaner claims to be 50W and 45kHz. I may make a bubble etch tank (or maybe even spray) but thought I'd try something different.

If it looked like it made any difference I would consider modifying the cleaner or coating the bath, but as it appeared to be nothing it would seem a bit pointless to destroy it.

I tried the sponge technique when an etch started well but then seemed to stop. It worked well, but definitely affected the thinner tracks and small text. I used photoresist boards so perhaps a little more delicate than toner.

Fred