  The observed electromagnetic (EM) properties of a nucleon at high energy are
studied to search for a possible metastable color superconducting phase, called
a virtual phase, that has an energy density close to the true ground state of
the vacuum. The discussion is based on a mechanism of spontaneous partial
breaking of the EM U(1) gauge symmetry inside a color superconductor. Favorable
evidences for such a scenario are found.
