Agree,
I have seen similar cases and we too draw the conclusion that it might be 
bubbles or a foreign particle that hindered the metallisation process.
Inge



--------------------------------------------------
From: "Werner Engelmaier" <[log in to unmask]>
Sent: den 17 June 2010 23:22
To: <[log in to unmask]>
Subject: Re: [TN] Thursday Quiz

> Hi Al,
> Desmear---not likely.
> Bubble during electroless flash or catalysation is a possiblility.
> Werner
>
>
>
>
>
>
>
>
>
>
> -----Original Message-----
> From: Al Onderick <[log in to unmask]>
> To: TechNet E-Mail Forum <[log in to unmask]>; Werner Engelmaier 
> <[log in to unmask]>
> Sent: Thu, Jun 17, 2010 5:16 pm
> Subject: Re: [TN] Thursday Quiz
>
>
>
> Hi Werner,
>        Anychance it has to do with the desmear process or a bubble in 
> electroless?
> -Al
>
>
>
>
>
> From:
> Werner Engelmaier <[log in to unmask]>
>
> To:
> [log in to unmask]
>
> Date:
> 06/17/2010 04:14 PM
>
> Subject:
> Re: [TN] Thursday Quiz
>
> Sent by:
> TechNet <[log in to unmask]>
>
>
>
>
>
>
> Hi Al,
> This looks like a PTH with some etchant entrapped having eation throughthe 
> copper.
> Werner
>
>
>
>
>
>
>
>
> -----Original Message-----
> From: Al Onderick <[log in to unmask]>
> To: [log in to unmask]
> Sent: Thu, Jun 17, 2010 5:04 pm
> Subject: [TN] Thursday Quiz
>
>
> What causes this ?
>
>
>
> http://www.austinwoodsandwaters.com/open-via.jpg
>
>
>
>
>
>
>
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