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PostPosted: Fri Jun 15, 2012 01:35:05 am 
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Joined: Wed Jun 13, 2012 18:04:53 pm
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Location: Degerfors, Sweden
Image

Left is a normal coloured 20k. stamp, in the middle the variation. The variation stamp is more like the 10k. stamp from the same set to the right.

Something chemical? The sun? Or am I a millionaire??


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PostPosted: Fri Jun 15, 2012 11:40:42 am 
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Is there a gum?
Looks like someone tried to remove foxing with Clorox bleach.


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PostPosted: Fri Jun 15, 2012 20:06:26 pm 
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Yes. The stamp is gummed. The gum looks typically for that period, and the stamp is MLH. Both circumstances advocates that it is original gum, but of course, you can never be 100% shore.


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PostPosted: Sat Jun 16, 2012 12:58:05 pm 
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Well, I know that it's possible to transform the green color into different shades of blue using different chemicals. Though, I don't know the exact formula.
May be, in your case it was the sun, indeed.

There is no information in catalogs on this stamp in a different color.
Proofs had the same color, but different perforation.


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PostPosted: Sat Jun 16, 2012 13:41:12 pm 
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Joined: Wed Dec 02, 2009 11:59:47 am
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Green ink is often an mixture of blue and yellow ink. It doesn't take much sunlight to start the yellow fading, leaving you with a blue stamp. No chemicals required. :)

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PostPosted: Sun Jul 15, 2012 05:01:17 am 
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UV exposure makes paper also yellow and brittle faster than someone would expect. And the resulting blue shade would not look very deep or even.


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PostPosted: Sun Jul 15, 2012 05:21:56 am 
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I was online for our Birthday Number 5!
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Joined: Sun Apr 01, 2007 02:10:49 am
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Allanswood wrote:
Green ink is often an mixture of blue and yellow ink. It doesn't take much sunlight to start the yellow fading, leaving you with a blue stamp. No chemicals required. :)


Greg,

That's "no chemicals" if you discount the billions of tons of burning hydrogen, I guess :lol:


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