A glass is found with a strange residue at the crime scene. What does the detective analyze to find the truth?

Category: Mystery · Difficulty: expert

Hint: Consider what can reveal hidden dangers.

Answer

The chemical composition

Explanation

Analyzing the chemical makeup can reveal whether the residue is toxic or a harmless substance.

This is a expert mystery riddle — one of the harder riddles here. The answer is The chemical composition.

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