(i) All P-A and A-A collisions, except for Pb-Pb, [*look  like*]{} $J/\psi$ production in proton-proton collisions with absorptive final state interactions corresponding to a $``J/\psi''$ cross section with nucleons of 7mb\[16,17\]. (ii) Pb-Pb central collisions have a $J/\psi$ cross section which is significantly suppressed with respect to (i)\[18\] .

Kharzeev and Satz\[49\] have suggested a picture that considers the system moving though the nuclei, after the hard collision which produces the $c\bar{c}$  pair, to be a   $(c\bar{c}g)$ color singlet system which, if it suffers no reaction with the nuclear medium, turns into a $J/\psi$ after the $(c\bar{c}g)$ system has passed through the material. The $(c\bar{c}g)$ system is supposed to have a size comparable to that of the $J/\psi,$ but, because of the fact that it looks like an octet dipole formed from $(c\bar{c})_8,$ and a gluon a cross section of 7mb is natural. This is an interesting picture, however, there are a lot of unanswered questions. (i) Where does the gluon in the $(c\bar{c}g)$ system come from? Does it come from the hard scattering or is it part of the gluon distribution of the incident hadron or nucleus? If it is the latter does this $enhance\ J/\psi$ production in nuclear 