Expert Film: Jon Badgery explains how certain materials react to different types of light.

Discover how glow-in-the-dark paints respond to different wavelengths of light, demonstrating the relationship between energy and light emission. By shining red, green, and ultraviolet light onto a canvas, you'll see which types of light trigger chemical reactions, revealing the energy levels of various wavelengths, and how ultraviolet light can be used to induce colour changes in materials like printed fabrics.