with $\epsilon
\approx 0.1,$ through the highest Fermilab energies it is argued that there already is strong evidence of unitarity corrections being important from the ISR to Fermilab energy regimes. In particular, we suggest the lack of growth of the single diffraction dissociation cross section\[2-5\] as due to the blackness of central proton-proton and proton-antiproton collisions.

In contrast to a very weak growth of the single diffraction dissociation cross section in hadronic collisions the energy dependence of virtual photon diffraction dissociation appears to be significantly stronge\[6-7\] than that expected from soft physics. In Sec.3, we argue that this may be due to blackness for the soft components of the virtual photon’s wavefunction and a subsequent dominance of the process by semihard components as suggested recently by Gotsman, Levin and Maor\[8\]. If this is indeed the case it means that for the first time one has evidence of unitarity (nonlinear) effects extending into the semihard regime of QCD.

In Sec.4, we remark that the new DØdata\[9,10\] on rapidity gaps between jets showing that the gap fraction of events decreases with energy may be due to the same physics which slows the growth of the single diffraction cross section. If this decrease 