  Hadronic events in $e^+ e^- \to Z^0$ are generated by a Monte-Carlo model
including the production of colour separate states. These events are compared
with those produced by the JETSET with default set of parameters where the
colour connections are colour singlet chains. By selecting two-jet-like events
and a sensitive observable, we find that these two kinds of colour connections
lead to significant differences in the hadronic states.
