00:00Why did no one dare to open a letter sealed with wax?
00:02About 100 years ago, when finishing a letter,
00:05people would let hot wax drip over the closure and press their personal seal.
00:08This way, their privacy was literally protected.
00:11But the most interesting thing is that, if someone tried to open it,
00:14it was immediately noticeable.
00:15The wax would break, crack, or become deformed.
00:18No matter how well you try to fake it, the evidence was always there,
00:21and the seal was even difficult to imitate.
00:23Royalty-used family crests.
00:25Merchants had their own symbols,
00:26and ordinary people created simple but unique designs.
00:29No one could replicate that mark exactly.