Coming back to the £ 10 Britannia mentioned earlier (and going slightly off topic), here are the two printings of that stamp.
The green words "TEN POUNDS" behind and under the £10 value in the lower left corner show no fluorescence and turn dark green (Leuchtturm long-wave lamp):
On the stamps from plate 2A, the green words "TEN POUNDS" behind and under the £10 value in the lower left corner fluoresce bright green (Leuchtturm long-wave lamp):
The fluorescence should not be confused with that of other elements such as the shield and the background to the word "pounds" at left that is common to all these stamps.
Posted 05/21/2021 5:02 pm
