Or somebody sneezed.
You might try to recreate the spots by flicking some water on the panel.

It could also be algae growing in the tanks.

When I hear black spots on copper I think tarnish.

Hans

-----Original Message-----
From: JaMi Smith [mailto:[log in to unmask]]
Sent: Thursday, March 21, 2002 2:57 PM
To: [log in to unmask]
Subject: Re: [TN] Tiny black spots on copper foil surface


Shirley,

Sounds like it might be very very small pin holes in your resist that is
letting in a microscopic amount of etchant.

JaMi Smith

-----Original Message-----
From: Shirley Xiao [mailto:[log in to unmask]]
Sent: Wednesday, March 20, 2002 11:14 PM
To: [log in to unmask]
Subject: [TN] Tiny black spots on copper foil surface

Dear All:
We encountered a problem after develop, etch & strip.
Lots of tiny black spots were found on copper surface.
We are sure that these tiny black spots are not
oxidization.They can not be removed by acetone but is
removable by micro etch.Before get result by EDX
element analysis, I wish anyone have similar
experience can share some information with me.


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