When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?

When a crystal of potassium permanganate is placed in a beaker of water, the water slowly turns blue on its own, even without stirring. Both potassium permanganate crystal and water are made up of tiny particles. On dissolving, the particles of potassium permanganate get into the spaces between the particles of water.