Re: [EE] Intentionally delaminating a PCB

H2S is highly toxic though so be careful.

On Thu, Apr 3, 2025, 18:47 smplx <[email protected]> wrote:

>
>
> On Thu, 3 Apr 2025, madscientistatlarge wrote:
>
> >
> > You also might want to dye the copper or epoxy if you need better edge
> detection.  Not sure what dye to use, probably something that
> stains/darkens the copper surface.
>
> Hydrogen sulphide (H2S) will react with copper to leave a black residue,
> H2S can be produced by adding an acid to iron sulphide.
>
> In the past I've had both methylene blue and malachite green stain plastic
> aquarium tubing and silicone adhesive. I don't know how these would affect
> epoxy.
>
> Regards
> Sergio Masci
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