" These marbles normally Use a attribute "nine"-formed swirl about the pole opposite the pontil, with a "tail" wrapping throughout the marble to terminate within the pontil. Most Leighton marbles comprise oxblood, the invention of and that is normally credited to Leighton, though some German marbles with oxblood predating Leighton's http://www.fanfiction.net/~Parker1e94xma6