I can change colors and states, often found in solutions, but my true identity is revealed when I react. What am I?

Category: Science · Difficulty: expert

Hint: Think about substances that signal pH changes.

Answer

pH paper

Explanation

Litmus paper changes color in response to acidic or basic conditions, revealing the pH of a solution.

This is a expert science riddle — one of the harder riddles here. The answer is pH paper.

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