Re: [EE] Intentionally delaminating a PCB

smplx <[email protected]>
Newsgroups gmane.comp.hardware.microcontrollers.pic
Message-ID <[email protected]> 

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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