I'm with Chris P - they aren't seafoam green, like a Fender seafoam where the original pigment was an aqua color. The ones that appear metalic green are probably the blue where the topcoats have yellowed out (either naturally or "speeded up" by reacting to the auto paint under it) which causes them to go green. The Blue was - I suspect - a mixed metallic, as opposed to the Sparkling Burgundy of EB2/ES335/Trini Lopez fame. That was regular old SG Cherry sprayed over an opaque silver base. In short I would bet a couple of rubles that the two Newports (the green and blue) in Barkless Dog's wall of wonder photo - started life as the same blue color, or really close. This blue turning to green phenomenon is fairly well known in Fender circles, as well as instances where two of the same color (say Lake Placid Blue for instance) have reacted over time differently - one being almost the same as when new and one changing so much that you would never believe they were the same. Why that happens is hard to call - it could be storage or it could be chemical. It could be the chemical happened right off the bat in the factory, and they sent them out anyway. Which sounds like something Gibson would do as a lot of the color coats were to sell seconds as first grade. Sometimes hidden areas - in control routs or under guards or parts - don't change, but sometimes they do. So, again, I would venture - and maybe some of our reranch and vintage Fender friends could bear this out - the many green Epi and Gibson basses actually started life 40 odd years ago as blue.