I have a fresh set of NOS emblems here, and the tint is most certainly transparent/translucent. I haven't yet achieved the clarity of the original, but it's not far off.

My emblems, used for experimentation, lack the sparkle of fresh chromed castings. This is especially true where the original plastic overlay lost its bond and trapped moisture for extended periods of time. Polishing didn't help on this particular piece. The gas door emblem off the '68 does not look quite so hopeless, and has a better prognosis. Paint says allow to dry 24 hours before baking, so I will. Pics late tomorrow or Wednesday.