Hi There,

There is a similar test solution of cupric chloride (50 g/l) plus HCl 200 ml
/ l RT. copper goes dark brown. Pink spots indicate invisible acid resistant
material, like the very last stage of dry film development.
I agree silver works as well.

Besr Regaeds,

Ken McGowan
----- Original Message -----
From: "Brown, Matthew" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, March 14, 2001 12:33 PM
Subject: [TN]


> Does anybody know of a chemical that can be used to detect mono-layers
> of organic resist on top of copper?
> We've had issues in the past with resist residues left after develop
> causing plating problems. A fellow engineer
> mentioned that he had heard of a stain that would leave any contaminated
> areas on the Cu a different color. He
> did not know what it was however...
>
> Matthew Brown
> Metal Plating Engineer
> International Flex Technologies
> Phone: (607) 658-5032
> Pager: (607) 778-4554
>
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