This is actually a very nice green CD 132 'bullet' that I was trying to photograph with the text mode for greater detail. One of the mode options on my camera is to create a negative image for white text on a black background. This apparently also creates an 'inverse' or negative of any colors present. It turns a nice green into this shade of purple. Wish I had this in my collection! Book for a purple one of these is $400 - 500!

Here is what the [id=203433927; original color] is. Bill Meier derived that photo from talking the inverse of this photo!