1.  African money was always an extremely valuable commodity, which the colonial powers sought to make profitable for themselves.

2.  Each of these objects is, in fact, an example of African money.

3.  No one knows precisely where, when and how long early African money was made and used.

4.  Now both kinds of African money, mostly owned by collectors, are going public in two exhibitions.

5.  Now both kinds of African money, mostly owned by collectors, is going public in two exhibitions.

6.  Roberts said archeologists might eventually be able to trace the evolution of African money.