Quote Originally Posted by ccdjg View Post
Yes, its not a perfect test, but not bad. This is how it pans out:

A positive blue fluorescence This tells you that the paper or card substrate is post ca. 1950 with 100% certainty. So defnitely a fake.

No blue fluorescence About 90% certain it is genuine
A fake will only give a negative fluorescence result if (a) it was faked before 1950, or (b) was made after 1950 and the faker had access to non-fluorescent paper and knew about the uv test. A fake made before 1950 can almost certainly be discounted as faking did not become economically viable (at least for relatively low value items such as airgun ephemera) until ink jet and laser printing and colour photocopying were invented. A non-fluorescent fake made after i950 is going to be very unlikely (but not impossible) because non-fluorescent paper is no longer available to the general public (which is why bank notes are printed on non-fluorescent paper).
Interesting, probably forth the $5. But will I ever use it again?