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HI Brite Tagging For US Stamps

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United States
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Posted 07/29/2021   4:13 pm  Show Profile Bookmark this topic Add rus to your friends list Get a Link to this Message
Hello, Can anyone tell me how to acquire a list of those US stamps that were issued with Hi brite paper? Scott's catalog does not list them.] Thank you!
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United States
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Posted 07/29/2021   4:27 pm  Show Profile Bookmark this reply Add Petert4522 to your friends list  Get a Link to this Reply
I do not believe there is such a list.
I collect Transportation Coils, part of the plate number coils that have been issued since 1981. These coils have been printed on paper with added brighteners, but even here we do not have a listing.
By the way, it is not "tagging", but a chemical impregnation of the paper. Tagging would be a separate "color" printed on the paper.

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United States
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Posted 07/29/2021   4:29 pm  Show Profile Check 51studebaker's eBay Listings Bookmark this reply Add 51studebaker to your friends list  Get a Link to this Reply
You can use this link
Select the 'By Type' tab, then select 'Hi-Brite'

You can also 'Search By Keyword' and search on 'Hi-B', this will return many pages
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Posted 07/29/2021   7:32 pm  Show Profile Check eyeonwall's eBay Listings Bookmark this reply Add eyeonwall to your friends list  Get a Link to this Reply
It isn't just the paper that cab be hi-brite - I'm pretty sure they have put brighteners in the tagging lacquer on some stamps too. A large % or US stamps from the last 10 year give a strong reaction. It is why the tagging on many stamps appears to be bluish white. The tagging is still yellow green but it is getting swamped by the strong hi-brite glow.
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United States
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Posted 07/30/2021   10:09 am  Show Profile Bookmark this reply Add mstocky2 to your friends list  Get a Link to this Reply
Hi-brite generally refers to the type of paper a stamp is printed on. It can get confusing and seem complicated if you get to fixated on the term "Hi-Brite". In Boerger's book, "Handbook On U.S. Luminescent Stamps", he has a section on Fluorescent Paper. In these early tagged stamps he breaks fluorescent paper down into LO (low bright), ME (medium bright) and Hi-Brite. The fluorescent type papers he refers to and what they look like are not the same as more modern stamps, which is one point of confusion. The brightness of these papers is very even overall.

In the early 80's and possibly earlier you see paper that would be considered non-fluorescent but because luminescent fibers have been added the paper appears luminescent when viewed from a distance. The amount of fibers then impacts how bright the fluorescence appears.

For very modern stamps, last 5 - 10 years hi-bright paper is very very bright white under LW UV and unmistakable.

Brixton-Chrome has an excellent write-up on their website describing luminescent paper types.

While it describes Canadian stamp paper, they same descriptions can be applied to US stamps.

Keep in mind SW UV is used for viewing US tagging while LW UV is needed for paper identification.

Bottom line don't sweat the details. If you are interested in paper varieties the tagging DB many many stamps with paper varieties list. For a specific stamp, just look for the difference in brightness to separate them.

One big caution, used stamps can easily fools you and appear as hi-brites. Two things can cause a used stamp to fluoresce brightly. One is optical brighteners used in soaps/detergents added to make thing look brighter. Soap reduces the water surface tension and reduces the soaking time to remove a stamp, but the stamp absorbs these brighteners making them highly fluorescent.
The other cause is transference of the optical brighteners used on modern envelops. Modern envelops are extremely white under LW UV due to the brighteners and these brighteners can leach off of the envelop onto the stamp during soaking. These stamps appear to have a swirly bright luminescence to them.
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