A detective finds a note that was supposed to contain a confession, but it's completely blank. How can he figure out what it said?
Category: Mystery · Difficulty: expert
Hint: Consider methods of writing that aren’t immediately visible.
Answer
The message was hidden using lemon juice and revealed by heat.
Explanation
Lemon juice can be used as invisible ink, and applying heat reveals the hidden message.
This is a expert mystery riddle — one of the harder riddles here. The answer is The message was hidden using lemon juice and revealed by heat..
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