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The luminescence will begin blue, then shifts to red upon addition of the third solution. When the fourth solution is added, the reaction shifts to the green end of the spectrum. The third and fourth solutions are alternated, and the entire spiral emits various glows throughout the visible spectrum.
Different reactions release energy in different ways. Just as different amounts of heat are emitted during the course of different exothermic reactions, different wavelengths of light are emitted during the course of different chemiluminescent reactions. This demonstration involves three different reactions that produce three different wavelengths of light. The mixtures of these reactions produce various colors of light throughout the entire length of the spiral.
This material is based upon work supported by the National Science Foundation under Grant Number 1246120