"Transparent", more-or-less, with a soft yellow-white-ish appearance under the right lamp. Bright yellow became the norm with issues around 1972 after the pioneer taggings revealed themselves to be very useful. But I bet you knew that!
I had purchased a collection that had these stamps in the spaces for these varieties. I checked under both SW and LW and did not see anything. These were unused too. I was hoping I would have at least one.
Angore, not so fast buddy. The tagging on the early issues 62- 72 is much different than the newer general tagging used on Canadian stamps. You may not see the tagging on the early ones as easily as the newer tagging. To the naked eye the older tagging appears as almost a yellow oily stain on the stamp, while the newer GT can be seen at an angle as a shiny line.
The early OP2 and OP4 tagging glows momentarily after exposure to the UV lamp and is best viewed in a dark room. Because OP4 is migratory it can lose a bit of "flourescense" and be a bit harder to see, and can travel to other stamps creating "varieties" if they are improperly stored.
The newer General tagging flouresces under the UV exposure and is steadfast, and will not migrate.
I will see if I can get you some images. Longwave is best for Canadian. Do you have a copy of Canada Specialized catalogue?
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