I would be more concerned with the copper salts. They put copper in marine paint to prevent organisms from attaching to boats!
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Sunday, June 19, 2016 3:47 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] Etching with vinegar, peroxide and salt
I'd like to do that as well with the Muratic...question is what
does one DO with the spent etch? Might not be so good
in a septic tank IF that is permitted to pour the stuff down
the drain. Just asking...
Charlie
On 19 Jun 2016 09:01:49 -0700 "duwaynes@... [Homebrew_PCBs]" <Homebrew_PCBs@yahoogroups.com> writes:
One explanation I was given is that the vinegar reacts with the chloride in salt and produces a very weak hydrochloric acid. I tried it but it took forever to see any effect on the copper. Much easier to go and get a gallon of muriatic acid for $10. I only use about an ounce at a time along with 3 oz of peroxide and get boards etched in about 5 minutes.