To me transluscent looks more period correct for a 70's bike for some reason, but white looks better on most bikes. The nicest looking bottle I ever owned was a white one with big winged "C" Cinelli logos on it I got back in the late 80's. Sadly it outgassed it's plasticizers and cracked on me some years ago. Now if you can find them, sellers want big bucks for them....

Chombi