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Rob,
You could try the sponge type paint brushes. That would get you the sponge effect, and still keep your fingers out of the soup.
On 10/8/2016 8:53 PM, Dennis Shelgren nojoeco@... [Homebrew_PCBs] wrote:
Yes, of course gloves and glasses are required when working with anything volatile.
On Oct 8, 2016 8:52 PM, "Rob roomberg@... [Homebrew_PCBs]" <Homebrew_PCBs@yahoogroups.com> wrote:
I don't know about sponging hcl.... I'm not that brave.
I always wear nitrile gloves and glasses but I try to keep distance between the wet work and me.
The hcl/peroxide mix has to be occaisionally "regenerated" by having air put through it, like an aquarium bubbler/stone. If it's completely activated with copper and fresh or regenerated, you can actually etch with just a sponge it's that fast.
On Oct 8, 2016 6:33 PM, "Rob roomberg@... [Homebrew_PCBs]" <Homebrew_PCBs@yahoogroups.com > wrote:
My bottle of muriactic acid is at least 10 years old.
I only use about a shot glass of the stuff each time I etch boards.
I think thats about 50 ml.... so a 950ml bottle will etch 19 batches......
and a bottle costs $5 at the local hardware store......
so I don't think I will be using ferric chloride ever again.
Rob,
My guess is it's mainly for ferric chloride and stuff. That mix you and I are using seems to generate its own heat somehow, though I have heated it when it was acting weak. I still haven't figured out why mine got weak, but I'm guessing it's shelf life.
Take Care