They turned out to be a darker red, so I swapped them for the curtains flanking my fireplace. I just got the curtain clips today so they slide open easily (these are room darkening curtains, so it's been REALLY dark in my living room). I am loving the deep red against the white trim and dark grey wall.
And as a bonus, I think the former curtains look better in the dining room as well. I love happy decorating accidents!