re: Don't think so; look at Ariane 5'central engine...
Not to be argumentative, but doesn't this photo demonstrate what Lee is saying?
It looks like a shuttle launch, two big SRB's whose brightness seems to overexpose the image, making the LH/LOX exhaust plume look like a butane cigarette lighter.
Are there any other (Sea level) all LOX-Hydrogen launch photos to compare to?
But then maybe Un Epi De Mais is right about the ablative engine nozzle liners?
