Offical Baseball rule 8.02 The pitcher shall not (a) (2) Apply a foreign substance of any kind to the ball; (3) expectorate on the ball, either hand or his glove; (4) rub the ball on his glove, person or clothing; (5) deface the ball in any manner; (6) deliver what is called the "shine" ball "spit" ball "mud" ball or "emery" ball. The pitcher, of course, is allowed to rub the ball between his bare hands.
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