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In the 90’s when I worked in an electronics plant they used ammonium persulfate , I think towards the end though they had to save the used stuff and treat it as hazardous waste. I know if you mix sugar with it and heat ,it will explode. Ferric chloride on the other hand is easier to find as it is used in sewage treatment plants.
From: Homebrew_PCBs@yahoogroups.com [mailto:Homebrew_PCBs@yahoogroups.com]
Sent: Sunday, July 02, 2017 10:57 PM
To: Homebrew_PCBs@yahoogroups.com
Subject: Re: [Homebrew_PCBs] Ferric chloride staining PCB substrate
When I made boards back in the late 70's I used ammonium persulfate
most of the time. Works good, no stains.
I have no idea if it's still readily available or where to get it.
Steve
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At 06:56 PM 7/2/2017, you wrote:
>I have been using ferric to etch boards for a while now. Recently I
>got lucky and came into a cache of 1973 vintage copper clad PCB
>stock, which will enable me to make some reproduction pieces that
>are pretty much indistinguishable from originals in terms of
>look. However, I have noticed that the ferric solution stains these
>boards, adding a yellowish tint. Is there any way to avoid
>this? Or clean it after?