Color is the perfect marriage of the physical world and chemical composition. Whether it’s the paint on a canvas or the glow of a digital screen, it’s all just energy and atoms putting on a show.
Each color has a specific wavelength. Red has the longest (about 700 nanometers), while violet has the shortest (about 400 nm).
On a molecular level, color happens when photons strike electrons. If the photon has the right amount of energy, it "kicks" an electron to a higher energy level. The specific energy gap of that molecule determines which color we see. 3. Structural Color: Nature’s Glitter
The final step happens in your retina, which contains two main types of photoreceptors: For seeing in low light (black and white).
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