Digital BW, The Print

I just came from B & H. Photo in NYC where they were kind enough to print 
some of my files on their Epson 5500. We printed onto the museum parchment 
paper I supplied. I wanted to see a sepia print made on this unit. It was 
fantastic. It was so beautiful under their lights! Then I walked it outside. 
My beautiful sepia toned print turned green! I sell many of my images in 
outdoor circumstances. Even if they like the green, they'll be upset when 
they get the prints home and they turn brown! The 5500 is an awesome printer. 
I need an archival color printer now, without metamerism. Does anybody have 
one that works? (without metamerism). Maybe the MIS variable inks for sepia 
and something else for color?
Sorry for ranting,

George J Kunze