Antique objects made of Cu-Sn or Cu-Zn alloys have been widely characterised by neutron diffraction. However, the employment of binary alloys gave way to the use of more common ternary (Cu-Sn-Zn) alloys around the beginning of Roman Empire. Characterisation methods of ternary alloys with neutron methods are rather sporadic. Aim of the present research is to study Cu-Sn-Zn alloys of known chemical composition, both as-cast and annealed, in order to a) provide more accurate descriptions of ¿Sn equivalent¿ Vegard-type relationships and diffraction data for ternary copper alloys than presently available; b) contribute to a database for archaeometallurgical research with neutrons. The project is a continuation of RB960027 experiment on INES (see report). We now propose to finish the as-cast collection (6+9 measurements) and to measure again the remaining 37 tests that we have now annealed.