The "Minty White" paper insert controversy

One of the long standing debates in the vintage poster collecting world is that of the authenticity of "minty white" inserts found from the movies of the 1970's and 1980's that are printed on a different type of paper than any other at the time. They are a whiter than white, glossy on both sides print, which is where the nickname came from.

The controversey lies in the fact that thousands of these posters have been sold on ebay over the years (not as much recently), and they would fetch the same price as an original. However, there seemed to be an almost unlimited supply of these posters, which brought into question their authenticity. For years there has been a kind of "debate" as to if these posters are real or not.

The easiest way that I can think of to decide is to look at current prices on them. If you try and sell on on ebay these days, you have a very slim chance of getting the same price as a confirmed original - this speaks pretty clearly that most collectors DON'T consider these minty whites to be originals.