The above interpretation is in the partonic language, which uses quarks and gluons as the degrees of freedom. Due to the quark-hadron duality, or parton-hadron duality, meaning that all QCD predictions can be expressed using a hadronic basis, color transparency can also be described using hadronic degrees of freedom. In that case, the ejectile, although not a hadron (i.e., not an eigenstate of the QCD Hamiltonian despite being color singlet), can be represented as a superposition of hadrons. Such a superposition state has a smaller size than each individual hadron. As the ejectile propagates in the nucleus, all but one of the hadron states constituting the ejectile state are filtered out by the interaction of the ejectile with the nucleons in the nucleus. The remaining hadronic state corresponds to the hadron eventually produced in the reaction. The filtering out of the other states occurs after a typical formation time τ τ f . If the distance c τ τ f is larger than the nucleus size, then no filtering happens in the nucleus, the ejectile keeps its small size, and propagates largely unhindered. This is color transparency described with hadronic degrees of freedom.