This is an first try with metallic pigment over epoxy resin, sometimes referred to as “cold cast metal”:

The cast is poured silicone on a carved cement “egg” (Prometheus).  The both of these are epoxy resin. For the first one I dusted the mold with PearlEx antique bronze pigment, then poured nvirotex pourable coating resin ( since I did not have the preferred epoxy for casts). It still seems to work OK, the second one is the same clear resin with no PearlEx  but with purple opaque pigment added.