A diary page seemed blank until exposed to heat, revealing a confession. How was this message concealed?
Category: Mystery · Difficulty: expert
Hint: Think about materials reacting to physical changes
Answer
The ink was made from heat-sensitive substance
Explanation
Special ink that becomes visible only when heated was used to hide the confession.
This is a expert mystery riddle — one of the harder riddles here. The answer is The ink was made from heat-sensitive substance.
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