 red wavelengths, the blue wavelengths, the green wavelengths, all the wavelengths, all the colours that you can think of. But the actual spectrum of light goes well beyond on either side of that short visible spectrum. And ultraviolet light is wavelengths shorter. So the ultraviolet region starts at about 350 nanometres and goes down to, let's say, about 200 nanometres. And in this project, we're particularly interested in deep ultraviolet wavelengths. So wavelengths of, say,