What's Left Of Op4 Tagging After Nearly 40 Years Of Creep

544ip 8c slate library on plain(NF) pager dex gum OP4 tagging.

below is a present day photo of stamp under UV light. Paper is now flrsc and tagging does not exist. Some remainders can be seen as faint line at upper right.



This is not what it looked line when encased way back when.

Posted for your information.

Did the tagging just fade away or was it rubbed off, or what? I would be interested in knowing how this happened.

Also when you say the paper is now fluorescent, does this mean that the paper was not originally that way?

This raises all sorts of questions.

this has been stored by itself in a large clear plastic mount in storage all these years. It has just flowed out into the stamp and along the plastic mount. This stamp has been stored and not looked at for 30 or more years. This stamp was supposed to be on dull or low fluorescent paper but now looks med to high fluorescent.

Just think of the what happens to other stamps near or in contact with this and the changes they could go through to cause mistaken unlisted paper varieties and tagging errors on these stamps.


Sorry the photo is fuzzy but my camera's focus is starting to fail.

OP4 was canada's first fluorescent ink used and failed because it flowed. It was replaced by OP2. The last I saw the stamp (30 or more yrs ago) the tagging still existed but was flowing in a line across the bottom of the plastic mount and along the edges of the stamp paper.

Very interesting BWDavis. It certainly does raise all sorts of questions.