Several years ago at my first marble show a seller offered a vibrant Akro prize name cork with an electric light lime-aqua color in it that I've not seen since. He was selling it for $50. He said it was a very early example when there Arnold Fiedler was mixing up crazy colors (or possibly when someone else was using his recipes later), but I've since not seen any with those colors except a vibrant orange and blue and orange and green. Does anyone have more information on these, or pictures of them?