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Material used for golden glimmer on this brown 5c stamp  
 

 
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Pillar Of The Community

Germany
812 Posts
Posted 09/26/2017   10:18 am  Show Profile Bookmark this topic Add stamperix to your friends list Get a Link to this Message
Hello,

what was used in printing production that is or has developed to such a golden glimmer like in the shown stamp?

I know this is not really gold :) and not rare as I have seen several like this. I just want to know the reason and name of the material / ink / print finishing and why it is not present at any other stamp colors or other stamp issues?

Kind regards,
stamperix

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Edited by stamperix - 09/26/2017 10:19 am

Pillar Of The Community
United States
5461 Posts
Posted 09/26/2017   10:25 am  Show Profile Check Petert4522's eBay Listings Bookmark this reply Add Petert4522 to your friends list  Get a Link to this Reply
Looks to me like it is an atmospheric thing - this stamp is probably going to be a changeling.

Peter
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Pillar Of The Community
United States
1469 Posts
Posted 09/26/2017   11:18 am  Show Profile Bookmark this reply Add bookbndrbob to your friends list  Get a Link to this Reply
It would be great to get a technical explanation of this. It looks like a precipitate on top of the ink.
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Pillar Of The Community
1163 Posts
Posted 09/26/2017   11:43 am  Show Profile Bookmark this reply Add rogdcam to your friends list  Get a Link to this Reply
I have seen older orange issues do the same thing as they oxidize.
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4819 Posts
Posted 09/26/2017   11:44 am  Show Profile Check 51studebaker's eBay Listings Bookmark this reply Add 51studebaker to your friends list  Get a Link to this Reply
I am fairly sure that older inorganic inks can have metallic elements in the pigments. Goggling will offer some info but perhaps we have a chemist among us that can assist?
Don
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Pillar Of The Community
United States
860 Posts
Posted 09/27/2017   5:04 pm  Show Profile Bookmark this reply Add hy-brasil to your friends list  Get a Link to this Reply
Yes, it's from the heavy oxidation; there is a metal component to the ink here. It's been badly stored, perhaps near a coal-fired furnace, coal-oil gas light or lamp, that contained a fair amount of sulfur/ sulfur compounds.

Excellent photo showing this.
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United States
3606 Posts
Posted 09/27/2017   5:14 pm  Show Profile Check revenuecollector's eBay Listings Bookmark this reply Add revenuecollector to your friends list  Get a Link to this Reply

Quote:
Goggling will offer some info...


Only if you have bad eyesight.
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Pillar Of The Community
Germany
812 Posts
Posted 09/28/2017   04:15 am  Show Profile Bookmark this reply Add stamperix to your friends list  Get a Link to this Reply
Thank you for all your answers, also hy-brasil's explanation. While I have seen this also on one or two other brown 5c, I never have seen it for any other stamp, also other countries. So it must have been some ink try for this brown color stamp in its first issue, which before and later wasn't done again. Maybe the ink was too expensive this way or not reliable enough. There is so much to learn and research at stamps, you never know where to begin and take your time...
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Bedrock Of The Community
Australia
22373 Posts
Posted 09/28/2017   06:30 am  Show Profile Bookmark this reply Add rod222 to your friends list  Get a Link to this Reply

Quote:
I never have seen it for any other stamp, also other countries.


I have fell for this curiosity myself, with Belgium.
I was convinced (at the time) this was a variety. I was politely advised otherwise.

If you click on the image, you can see the Value tablet has a silvery sheen.

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Edited by rod222 - 09/28/2017 06:32 am
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