This Demonstration shows the oscillatory behavior of the Belousov–Zhabotinsky reaction (BZ reaction), which was modeled by Field, Körös and Noyes (FKN) in the early 1970s. The oregonator model resulted from their work:

,

,

,

,

,

where,, , , , and .

The law of mass action yields the following nondimensional 3×3 system of nonlinear ODEs:

,

δ ,

,

where , , and ; , 4, and .

When the Ce(IV) concentration reaches a maximum the solution turns blue. This concentration oscillates and when it is very low, the solution in the beaker turns red.

I. R. Epstein and J. A. Pojman, An Introduction to Nonlinear Chemical Dynamics: Oscillations, Waves, Patterns, and Chaos, New York: Oxford University Press, 1998.