Lena Blackbourne's Rubbing MudThe baseballs get rubbed down before the game. A special mud is rubbed into the baseballs before the game by the umpires to take away the shine on the ball. The mud comes from a river in New Jersey, by a company started by Lena Blackburne. The place where the mud is found, and the elements used in the mixture are a well kept company secret. Lena Blackbourne's Rubbing Mud has been used since 1938, and is still used today in Major League Baseball.