I heard back from Ron Skarin, ex national champ, Olympian and US national team member, who got a Titan in 1974 which he still rides on a weekly basis, to wit:
<<Yep they were anodized, mainly to provide a consistant color for the finish. Bare titanium looks dirty from oil, and general exposure, plus it took a lot of work to buff out the burn marks left from welding.
I have seen a few Titanium frames that were polished almost like chrome or aluminum.
They were all glass beaded, and quite a few frames were painted with a baby blue imron paint (I had one of those for a while). >>