I can change colors and moods, yet I am not human. What am I?

Category: Science · Difficulty: medium

Hint: Think about what can show acidity or alkalinity.

Answer

A mood-altering substance

Explanation

pH indicators change color based on the acidity or basicity of a solution.

This is a medium science riddle — a moderate challenge for most people. The answer is A mood-altering substance.

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