Quote:
Originally Posted by drcy
Postage stamps have longwave (blacklight) and shorwave uv markers used for automatic sorting and mailing, and there are variations that are collected/valued by stamp collectors. Some of the variations are quite interesting.
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And, if you're into German stamps, some shades respond to UV, some don't. Some of the shades that do react are hard to find and a handful can be pretty expensive.
I also have a couple foreign stamps that are on paper that reacts, and one on an envelope piece that reacts. That one is from the 1880's.
On a crazy "steve" side not, some early US stamps also have shades that react or not, and I haven't found that listed in any catalog. Collecting is very different from one country to the next, stuff we tolerate is very much looked down on in most of Europe.