RIRs, and a blue egg layer, regardless of where they come from will make green egg layers. If the blue egg layer only has one dominant blue egg shell gene(more common in hatchery EES) then some will be brown.So... all that aside -- I have three blue laying 'non-APA approved' maybe "ameraucanas" who lay darling little blue eggs.... and maybe my RIR casanova will turn out some green egg layers.... Guess I'll see..
The green will not usually be dark enough to make an olive color. RIRs are not listed as being a Dark brown egg laying breed.