A document showed important words that vanished when touched. What might explain this mystery?
Category: Mystery · Difficulty: easy
Hint: Consider ink types that change based on temperature
Answer
Heat-sensitive paint was used
Explanation
Heat-sensitive ink disappears when warmed by fingers, causing words to vanish.
This is an easy mystery riddle — a good one for children and beginners. The answer is Heat-sensitive paint was used.
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