guilloutran
Member 
Account Temporarily Disabled
Colllecting France
Posts: 202
What I collect: Western Europe (pre-Euro), France and colonies (pre-1995), United States and Canada (pre-1980, engraved ->2000), British colonies and United Kingdom (engrave to 2000)
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Post by guilloutran on Mar 20, 2021 10:37:26 GMT
Could somebody explain me between “tagged” and “untag” paper? I was adding stamps in my Colnect inventory and I came across this term, I just selected them randomly 😂. But now I kinda wanted to know what does they meant?
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angore
Member
Posts: 5,348 
What I collect: WW, focus on British Empire
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Post by angore on Mar 20, 2021 11:01:11 GMT
Tagging is associated with phosphorescence of paper. Under UV light, the paper will continue to glow (often very briefly) once with the UV light is removed. Tagging can be applied in the paper, on top of the paper as a coating (below printing), or over the printing. Tagging is intentional but general luminescence where paper can be bright or dark under UV due to paper makeup may or may not be intentional.
Tagging is usually applied to assist with auto cancellers (locating and canceling stamp).
You often need a UV light to see.
I will add that sometimes all over tagging (like on paper) can be confused with paper luminescence since they both can glow under a UV light.
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