Steve

If you put to much thought into the eraser bit, you will drive your self crazy.  Let me enlighten you what could happen using an eraser.  Taking a silicone and rubbing 99.99% soft Au bond leads will remove stains but as well remove the 30-50 micro inches of Au exposing Ni.  Silicone is an organic and in essence, you are spreading organics all across the Au surface.  I have wire bonded to erased Au, with exposed Ni and had good bond pull XBAR (high teens) and low sigma (<.75).  

Try the other stuff first in my first message but then try eraser as a last resort.  Just do it and do it gently.  Do not erase Au like you would erase pencil lead.

Good Luck!!
Best Regards,

David Jandzinski
Substrate Product Engineer
Abpac, Inc


-----Original Message-----
From:   Russell Spivey [SMTP:[log in to unmask]]
Sent:   Friday, November 20, 1998 2:31 AM
To:     [log in to unmask]
Subject:        Re: [TN] Gold Finger Stains

Steve,

Try a standard white rubber (UK speak) or eraser (USA speak). Just a light
rub should polish up the gold.

I have used it in the past quite effectively for tarnish & surface
contaminants on gold finish.

I have not done any analysis as to the effects of using this method but I am
sure some of our colleagues out there will put us right if they figure out
any detrimental effects.

Regards,

Russell Spivey

> -----Original Message-----
> From: Joy, Stephen C [SMTP:[log in to unmask]]
> Sent: Thursday, November 19, 1998 6:38 PM
> To:   [log in to unmask]
> Subject:      [TN] Gold Finger Stains
>
> Can anyone tell me how to rework water spots or stains on gold fingers?
>
> There are not that many, so there is no point to do rel testing to
> validate
> it
> is OK, but I don't want to just ship them to cutomers.
>
> All help appreciated.
>
> Steve
>
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