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United States/Stamps : About prephosphored paper

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virgilp
04 Dec 2017
09:43:10am

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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.

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angore
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Enjoying the little works of art
04 Dec 2017
11:22:38am
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.

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amsd
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Editor, Seal News; contributor, JuicyHeads
04 Dec 2017
11:47:17am
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.

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virgilp
05 Dec 2017
03:23:57pm

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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"?

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mbo1142
05 Dec 2017
03:44:26pm
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

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angore
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Enjoying the little works of art
05 Dec 2017
06:36:43pm
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.




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seanpashby
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05 Dec 2017
09:58:29pm
re: About prephosphored paper

Maybe this will help. Courtesy of TBR Stamps on ebay.

Image Not Found

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angore
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Enjoying the little works of art
06 Dec 2017
07:26:18am
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

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virgilp
06 Dec 2017
08:40:25am

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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?

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angore
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Enjoying the little works of art
06 Dec 2017
08:55:42am
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.

Image Not Found

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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virgilp
06 Dec 2017
07:25:15pm

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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.

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angore
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Enjoying the little works of art
07 Dec 2017
07:27:52am
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.


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John Macco
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Astrophilatelist- Space Cover Collector
17 Dec 2017
03:39:06pm
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.

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angore
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17 Dec 2017
05:56:14pm
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

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phos45
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https://machinstudygroup.blogspot.ca/
18 Dec 2017
02:40:27pm
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

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https://strathdee1.blogspot.ca
phos45
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https://machinstudygroup.blogspot.ca/
18 Dec 2017
02:47:02pm
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

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https://strathdee1.blogspot.ca
        
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