A sealed envelope contains a note that disappears when opened normally but reappears when held to light. How was this done?
Category: Mystery · Difficulty: hard
Hint: Invisible writing can hide messages from plain sight.
Answer
Message written with invisible ink
Explanation
Invisible ink only becomes visible under certain conditions like heat or light, explaining the vanishing note.
This is a hard mystery riddle — a tricky one that takes a little thought. The answer is Message written with invisible ink.
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