The concepts of Topological Parity and and Topological Torsion, as applied to electromagnetic systems undergoing chemical evolutionary processes, suggest methods of how to influence the production rate of chemical enantiomers. In agreement with the suggestion of Pasteur, parallel E and B fields are necessary to produce chiral separation, but the condition of non-orthogonal E and B is necessary not sufficient. A clue is given by the fact that for a classical electromagnetic field generated from a set of vector and scalar potentials, the Pfaff dimension of the 1-form of electromagnetic action must be 4 in order to admit parallel E and B fields. IF the Pfaff dimension is not 4 then there exist extermal processes for which the Virtual Work 1-form is zero. It follows that such processes are thermodynamically reversible.

On the otherhand, if the Pfaff dimension of the Action is 4, then there do not exist extremal fields such that the virtual work 1-form is zero. There do exist, however, symplectic (non-extremal) processes such that the process is reversible, even if the Pfaff dimension is 4. Such reversible symplectic processes would not be expected to produce left handed or right handed dominance in chemical reaction rates.

The question is how to produce a process where the electromagnetic current flow is in the direction of the Torsion current. The Torsion current defines a process which is thermodynamically irreversible.