Quote:
AlEGator: watermarking fluid
With all due respect to Gator, I think this one definitely depends on what country you collect. In 20 years of collecting USA, Canada, and the United Nations, I've used fewer than two drops of watermarking fluid.
Zed, you mentioned "tweezers" so let me add a clarification...
In the USA, most of us use Stamp
Tongs. As Gator said, they're sort of like Tweezers, but gentler on stamps. They look something like this...


Just to make things a little more confusing, our friends in other parts of the world (U.K. & Europe) often use the word TWEEZERS to describe the same instruments

So, bottom line, make sure you're using STAMP tongs/tweezers, not bathroom tweezers!
If you already know all this and I've insulted your intelligence, forgive me.
Kirk