In order to maximize speed and compatibility with various graphical web browsers, I have largely limited myself to the 216 colors used by Netscape running under Windows with 8 bit video. That leaves only about 75 colors to use, including bright and dark shades. In addition, the color phosphors used in computer monitors are not capable of accurately reproducing spectral colors, especially not deep red, deep green, and deep cyan. Explanations First spectrum is hydrogen, typical of a hydrogen spectrum tube. Second spectrum is helium, typical of a helium spectrum tube.
Third spectrum is lithium, as typically from a flame or an electric arc.
Fourth spectrum is neon. Fifth spectrum is low pressure sodium, but with secondary lines exaggerated. Sixth spectrum is argon, typical of an argon glow lamp. Oxide lines which may appear in the flame spectrum are not shown. Next spectrum is zinc, drawn using a wavelength table and a photo by Ioannis Galidakis of a zinc arc spectrum.