In a gallery, a painting changes colors every hour. What is the artist's secret?

Category: Mystery · Difficulty: medium

Hint: Consider paints that react to temperature.

Answer

Thermochromic paint

Explanation

Thermochromic paint changes color with temperature, creating the illusion of a painting that alters over time.

This is a medium mystery riddle — a moderate challenge for most people. The answer is Thermochromic paint.

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