  The transition from the hadronic phase to the phase of
color-superconductivity at large densities is addressed by an effective theory
which incorporates the Yang-Mills dynamics in addition to the di-quark degree
of freedom. A toy version of this theory is studied by lattice simulations. A
first order phase transition separates the regime of broken color-electric flux
tubes from the color superconducting phase. My findings suggest that the quark
and gluon liberation occurs at the same critical chemical potential.
