[time-nuts] Remove Pictic boards from envelopes

[Stanley Reynolds]

The boards were PB free so the finish is a flat silver . My thinking is the 
envelopes are acidic and any moisture would cause a reaction. The boards were 
shipped to me vacuum sealed in plastic 25 boards per pack. They were not brown 
or discolored when I put them in the envelopes so what ever caused them to 
discolor happened while they were in transit.

Stanley




________________________________
From: "GandalfG8 at aol.com" <GandalfG8 at aol.com>
To: time-nuts at febo.com
Sent: Fri, August 6, 2010 10:23:02 AM
Subject: Re: [time-nuts] Remove Pictic boards from envelopes


In a message dated 06/08/2010 16:15:40 GMT Daylight Time,  
ed_palmer at sasktel.net writes:

You mean  they are tinned?  I received my two boards a couple of days  
ago.  I thought that they missed the tinning solution.  There's  just an 
occasional splash of bright tin here and there, particularly on  the 
back.  The rest looks like oxidized copper.  I haven't tried  to solder 
them yet.  Hope the rosin cuts through  it.


-------------
That's what I first thought when mine arrived but found that rubbing with  
a soft pencil eraser removed the discolouration to leave them looking  
tinned again.
I did notice that some of the non discoloured tinning had a matt finish  
rather than shiny as expected so not sure if this was envelope contamination 
or  a processing issue.
After buffing with the eraser I washed the boards in warm soapy water  just 
to be sure and they continue to look ok.

regards

Nigel
GM8PZR
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