The pink bags are death on wire-bondable gold.  It's my understanding that
they contain a fat type substance.  Perhaps this is what you see.

----------
> From: Mike Bailey <[log in to unmask]>
> To: [log in to unmask]
> Subject: [TN] Anti-Static Bags
> Date: Thursday, June 04, 1998 9:33 AM
>
> Has anyone experienced problems with packaging bare PCB's in the pink
> anti-static bags?  We are seeing a "waxy"image transfer from the bag to
> the panel after what appears to be several months of storage in a
> controlled atmosphere.  It is aggravated by stacking individually
> packaged boards on top of each other and has occurred on several
> different surface finishes. The substance can also be found on the
> non-board side of the bag.  Does anyone know of  what the coating might
> be comprised?  Would you predict solderability issues etc?
>
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