johnamichael
Member 
Posts: 74
What I collect: Newfoundland, Early Canada, Weimar Republic/Third Reich-Germany
|
Post by johnamichael on Nov 1, 2022 15:46:15 GMT
Can anyone suggest an efficient method to scan a large number of stamps for phosphorus tags. The books say you can see them but for some reason I can not see them myself.
Thanks,
John
|
|
renden
Member
Posts: 8,711 
What I collect: World W collector with ++ interests in BNA (Canada etc) and USA
|
Post by renden on Nov 1, 2022 16:50:36 GMT
SG says you need a U/V lamp to see phophorus paper but for bands, when I did some pre-1979 GB stamps, the bands were seen by naked eye.
There must be a thread on the subject....I will check
René
In search just type phosphorus stamps and you will find some posts on the subject
|
|
vikingeck
Member
Posts: 3,266
What I collect: Samoa, Tobacco theme, Mail in Wartime, anything odd and unusual!
|
Post by vikingeck on Nov 1, 2022 17:38:50 GMT
Sometimes visible on GB if tilted / slanted to the light, Other countries I don't collect so not familiar. However as they all react to UV light that is the only reliable way to spot the differences
|
|
johnamichael
Member
Posts: 74
What I collect: Newfoundland, Early Canada, Weimar Republic/Third Reich-Germany
|
Post by johnamichael on Nov 1, 2022 20:03:09 GMT
|
|
renden
Member
Posts: 8,711
What I collect: World W collector with ++ interests in BNA (Canada etc) and USA
|
Post by renden on Nov 1, 2022 20:21:42 GMT
Article is not specific for each Country......long or short UV !!  ? René Thanks |
|
angore
Member
Posts: 5,348
What I collect: WW, focus on British Empire
|
Post by angore on Nov 2, 2022 10:26:54 GMT
Yes, you first need a uv light. The small battery powered ones work best in a darker room. For US, it is best to have shortwave UV while many other areas you need a long wave. Now, some may confuse brighteners in papers, visible under LW, as tagging unless tagging is regional (does not cover entire stamp) so should have an idea how tagging is applied (overall, bars, blocks, etc), If you collect US stamps, this is what you should be seeing. stampsmarter.org/features/Tagging_Home.htmlGet a stamp that you know only was available as tagged and make sure you see that. |
|
johnamichael
Member
Posts: 74
What I collect: Newfoundland, Early Canada, Weimar Republic/Third Reich-Germany
|
Post by johnamichael on Nov 2, 2022 11:10:36 GMT
Thanks, that was an enormously interesting website. Since I collect Canada (until 2000), with some googling I found this Canada specific website. blog.arpinphilately.com/how-to-successfully-detect-tagging-on-canadian-stamps/In summary Phosphorous tagging was initiated in the Winnipeg PO in 1962. I understand that this is somewhat difficult to detect, sometimes with the naked eye, but there is usually an afterglow with UV light. This requires a short-wave light. In 1972 Fluorescent tagging was introduced, this is easier to detect but requires a long-wave UV light. Below is an helpful image.  It looks like the purchase of a dual wave UV light is in my future! |
|
renden
Member
Posts: 8,711
What I collect: World W collector with ++ interests in BNA (Canada etc) and USA
|
Post by renden on Nov 2, 2022 13:20:26 GMT
John
When you acquire a recent UNITRADE cat, you will see that there is an excellent reference on Tagging for Canadian Stamps (P 23 in my 2021) and USA Tagging also
Cheers - René
|
|
?