Re: Was the U.S.S. Horatio an Ambassador Variant?
IIRC, there were some early stills of the TMP refit w/ impulse engines running blue as well. I chalk this up to being like the amber/blue nav deflector debate (with the Enterprise-E, ironically, going back to an amber/yellow deflector after years of blue in all other ships).
I may appear unoccupied to you, but at the molecular level, I'm really quite busy.