The word foreign substances in baseball has been in the headlines this season. However, there is one and only foreign substance that is officially allowed to be used on the ball by the MLB officials.

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Notably, this secret trick to enhance the ball’s abilities for pitchers has been around for almost a century now. The South Jersey mystery mud is the only foreign substance that is used to better the grip of the baseball, as well as ensure the safety of the hitters.

The Secret behind Delaware River’s mud

Balls used in MLB matches are never pure white; however, they are shiny and pure white when they reach the teams. But, after reaching the franchise’ clubhouses, there is a game-changing technique used on the ball.

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Before every game, the baseballs are rubbed by mud specially brought in from the Delaware River on the Jersey side. The mud is officially called the Lena Blackburne Baseball Rubbing Mud, which is used in both major and minor leagues. Popularly known as mud man, James Bintliff is the founder of the company.

USA Today via Reuters

Many big companies have tried to copy and replace the Lena Rubbing Mud, but have always failed. The mud has magical properties; it instantly makes it less slippery and strengthens the grip for the pitchers. Notably, the mud application has to be done very carefully, without making it too dark for the hitters, and too light for the pitchers.

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Is MLB planning to replace the mud with better technology?

The authorities of the Major League Baseball had asked the baseball goods company, Rawlings, to manufacture a baseball with more tack. An experiment was also conducted with the new Rawlings balls, which were too bright, but provided a better grip.

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Ian Anderson of the Atlanta Braves

USA Today via Reuters

The drawback faced in these new balls was that the substance sprayed on the leather wore off too quickly. Rawlings had tried out the experiment in 2017; it’s been quite a while since then and the mud is still significant in the game. Do you think the magical mud will continue its supremacy in baseball balls or better technology will replace it?

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Shreya Verma

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Shreya Verma is a US Sports Content Strategist at EssentiallySports, with a focus on Olympic sports and athlete storytelling, covering beats like tennis, gymnastics, basketball, track and field, wrestling, and more. A qualified National Level air pistol shooter, she brings the unique perspective of both an athlete and a journalist to her work. Over the past four years at EssentiallySports, she has covered some of the biggest sporting stages, from managing the Olympic Sports desk during the Winter Olympics 2022 to spearheading the US Open 2025 coverage and content strategy. In 2024, she was on the ground in Paris for the Summer Olympics, where she interviewed legends and rising stars, including Carl Lewis, Laurie Hernandez, Fred Kerley, Noah Lyles, Quincy Hall, and Grant Holloway, who memorably offered her the chance to try on his gold medal. She also connected with icons and fan favorites such as Tom Brady, Katie Ledecky, Tara Davis & Hunter Woodhall, Andy Murray, Ilona Maher, Kevon Williams, Jonathan Owens, and Neeraj Chopra, while capturing emotional family perspectives from Nellie Biles, Jordan Chiles’ mother, Suni Lee’s mother, and Katie Ledecky’s brother, Michael. Her journalism is marked by authenticity, access, and a deep passion for highlighting perseverance and human connection in sports. Inspired by Olympic champions like Allyson Felix and Vincent Hancock, Shreya continues to carve her path as a storyteller.

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