Discussion - Member to Member Sales - Research Center
Discussion - Member to Member Sales - Research Center
1. Can I see the difference between stamps printed on prephosphored paper and phosphored paper?
2. How is the manufactured process for stamps printed on prephosphored paper and phosphored paper?
3. Will be the phosphor affected if a used stamp is soaked?
4. For simplicity a phosphored stamp is like a tagged stamp, isn't? Of course the chemicals used are different. Correct?
Thanks.
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The phosphorescent agent (taggant) can be applied to the paper before printing, applied as part of another coating (mixture) prior to printing, or after it is printed.
The tagging applied before printed usually has what they called the mottled or grainy look due to uneven paper surface while tagging applied as a coating (mixed with other stuff in paper making process) has a solid (smooth, even) look. The tagging applied over the printing will can look smooth or uneven. It often depends on the mats used to apply it.
Sometimes you can see the taggant on the stamp if over printing especially on engraved stamps.
Yes, a stamp with phosphor applied one way or another is called a tagged stamp.
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post-printing tagging will often, not always, be shaped, to fit the image, or part of an image, rather than blanket the pane.
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Now, after tagging/phosphorous stamps discussion is more or less clear and stamps has been used how can I separate them? Look at 4207-10 and 4207a-10a. How cam I determine which is a no "a" stamp and which is an "a" stamp? UV light will show a luminous stamp, but what type? Is there a simpler way to do it "precisely"?
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Try looking at the following link. It may help shed some light on the subject.
http://www.ebay.com/gds/Guide-to-US-Tagged-Stamps-/10000000002458564/g.html
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The sheet version (4207-10) was overall tagged and the booklet (4207a-10a) had mottled tagging. The booklet version has one straight edge on each stamp. Since the booklet is easy to determine, this can be an example of showing tagging differences between mottled and overall.
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Maybe this will help. Courtesy of TBR Stamps on ebay.
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Since some of TBRstamps images seem simulated
See this link of some images I have posted previously.
https://stamporama.com/discboard/disc_main.php?action=20&id=18182#136222
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Excellent! This is the kind of answer I wanted to get.
Now one more question: what installation or equipment you have used to get such images?
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I use a DSLR camera with a macro lens on a copy stand with 2 UV lights to get these images. You have to essentially force the camera to underexposure (at least 2 f-stops) to get the correct result. I do not use the wood supports but hold by hand.
You can "see" the same results with just one UV light but getting a good image is something else. For best viewing, you need to have a good UV light and view it in darkened room.
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Cannot keep my promise! My questions just popup without knowing when they will stop!
It seems that your UV lights are better that anything I found right now in internet. Who is the manufacturer and where can I buy them?
Thanks, again.
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Lighthouse, Raytech, and SAFE sells decent UV lamps. Most hobby supply places sell one or the other. You need to realize there are two types: shortwave and longwave. Tagging is checked with a shortwave.
Most lamps you see sold are 4W bulbs. These are not especially powerful and output does vary depending on battery condition (meaning brightest with new batteries). For shortwave use you often need to use in a darkened area since standard light can "wash out" the tagging (harder to tell the differences).
The lamps in my images are old Raytech units (metal case with AC plug). I got them off ebay.
One of the best ones around is the Raytech Versalume but it is expensive. It can be used in bright environments. I have one of those too. It works off AC or battery.
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If you can find a copy of a booklet Linns Stamp News published in 1990 titled: Stamps That Glow it gives you very understandable information about tagging and paper types.
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Here is an online article from Linn's Stamp News
https://www.linns.com/insights/stamp-collecting-basics/2007/october/hiding-in-plain-sight--basics-of-tagged-stamps-and-ultraviolet-l.html
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my uv photo system ...
icard camera : https://www.ebay.ca/sch/Publications-Supplies/83274/m.html?item=182117701169&hash=item2a670f9631%3Ag%3AvfEAAMXQLoZR01~5%5B%2Fimg%5D&_ssn=cbenbow
and 115v uv bulbs : led or flour
https://www.ebay.ca/sch/Light-Bulbs/20706/i.html?_from=R40&_nkw=uv%20lamp%20bulbs&_dcat=20706&Type=Blacklight&rt=nc&_trksid=p2045573.m1684
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tagging inks have 3 components : varnish, flourescent and phosphor pigments
forgeries offer varnish bands and/or flour marker
genuine stamps offer flour-phos bands, phos bands - and, varnish only ... the reason for uv tests
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09:43:10am
Questions:
1. Can I see the difference between stamps printed on prephosphored paper and phosphored paper?
2. How is the manufactured process for stamps printed on prephosphored paper and phosphored paper?
3. Will be the phosphor affected if a used stamp is soaked?
4. For simplicity a phosphored stamp is like a tagged stamp, isn't? Of course the chemicals used are different. Correct?
Thanks.
Login to Like
this post
re: About prephosphored paper
The phosphorescent agent (taggant) can be applied to the paper before printing, applied as part of another coating (mixture) prior to printing, or after it is printed.
The tagging applied before printed usually has what they called the mottled or grainy look due to uneven paper surface while tagging applied as a coating (mixed with other stuff in paper making process) has a solid (smooth, even) look. The tagging applied over the printing will can look smooth or uneven. It often depends on the mats used to apply it.
Sometimes you can see the taggant on the stamp if over printing especially on engraved stamps.
Yes, a stamp with phosphor applied one way or another is called a tagged stamp.
Login to Like
this post
re: About prephosphored paper
post-printing tagging will often, not always, be shaped, to fit the image, or part of an image, rather than blanket the pane.
Login to Like
this post
03:23:57pm
re: About prephosphored paper
Now, after tagging/phosphorous stamps discussion is more or less clear and stamps has been used how can I separate them? Look at 4207-10 and 4207a-10a. How cam I determine which is a no "a" stamp and which is an "a" stamp? UV light will show a luminous stamp, but what type? Is there a simpler way to do it "precisely"?
Login to Like
this post
re: About prephosphored paper
Try looking at the following link. It may help shed some light on the subject.
http://www.ebay.com/gds/Guide-to-US-Tagged-Stamps-/10000000002458564/g.html
Login to Like
this post
re: About prephosphored paper
The sheet version (4207-10) was overall tagged and the booklet (4207a-10a) had mottled tagging. The booklet version has one straight edge on each stamp. Since the booklet is easy to determine, this can be an example of showing tagging differences between mottled and overall.
Login to Like
this post
re: About prephosphored paper
Maybe this will help. Courtesy of TBR Stamps on ebay.
3 Members
like this post.
Login to Like.
re: About prephosphored paper
Since some of TBRstamps images seem simulated
See this link of some images I have posted previously.
https://stamporama.com/discboard/disc_main.php?action=20&id=18182#136222
1 Member
likes this post.
Login to Like.
08:40:25am
re: About prephosphored paper
Excellent! This is the kind of answer I wanted to get.
Now one more question: what installation or equipment you have used to get such images?
Login to Like
this post
re: About prephosphored paper
I use a DSLR camera with a macro lens on a copy stand with 2 UV lights to get these images. You have to essentially force the camera to underexposure (at least 2 f-stops) to get the correct result. I do not use the wood supports but hold by hand.
You can "see" the same results with just one UV light but getting a good image is something else. For best viewing, you need to have a good UV light and view it in darkened room.
4 Members
like this post.
Login to Like.
07:25:15pm
re: About prephosphored paper
Cannot keep my promise! My questions just popup without knowing when they will stop!
It seems that your UV lights are better that anything I found right now in internet. Who is the manufacturer and where can I buy them?
Thanks, again.
Login to Like
this post
re: About prephosphored paper
Lighthouse, Raytech, and SAFE sells decent UV lamps. Most hobby supply places sell one or the other. You need to realize there are two types: shortwave and longwave. Tagging is checked with a shortwave.
Most lamps you see sold are 4W bulbs. These are not especially powerful and output does vary depending on battery condition (meaning brightest with new batteries). For shortwave use you often need to use in a darkened area since standard light can "wash out" the tagging (harder to tell the differences).
The lamps in my images are old Raytech units (metal case with AC plug). I got them off ebay.
One of the best ones around is the Raytech Versalume but it is expensive. It can be used in bright environments. I have one of those too. It works off AC or battery.
1 Member
likes this post.
Login to Like.
re: About prephosphored paper
If you can find a copy of a booklet Linns Stamp News published in 1990 titled: Stamps That Glow it gives you very understandable information about tagging and paper types.
Login to Like
this post
re: About prephosphored paper
Here is an online article from Linn's Stamp News
https://www.linns.com/insights/stamp-collecting-basics/2007/october/hiding-in-plain-sight--basics-of-tagged-stamps-and-ultraviolet-l.html
Login to Like
this post
re: About prephosphored paper
my uv photo system ...
icard camera : https://www.ebay.ca/sch/Publications-Supplies/83274/m.html?item=182117701169&hash=item2a670f9631%3Ag%3AvfEAAMXQLoZR01~5%5B%2Fimg%5D&_ssn=cbenbow
and 115v uv bulbs : led or flour
https://www.ebay.ca/sch/Light-Bulbs/20706/i.html?_from=R40&_nkw=uv%20lamp%20bulbs&_dcat=20706&Type=Blacklight&rt=nc&_trksid=p2045573.m1684
Login to Like
this post
re: About prephosphored paper
tagging inks have 3 components : varnish, flourescent and phosphor pigments
forgeries offer varnish bands and/or flour marker
genuine stamps offer flour-phos bands, phos bands - and, varnish only ... the reason for uv tests
Login to Like
this post