Optic Yellow. When dirty, they can be mistaken for a dull fluorescent green, which I guess is where the confusion comes from.
Penn tennis balls have always seemed to have a more greenish tint (to me) than other brands (Dunlop, Wilson, Gamma, etc.), but across the board, the intended color is Optic Yellow.
They literally switched from white/grey to yellow in the 70’s to make them more visible on television screens … given that decision, why would they make them the same color as the grass or painted concrete?
Penn tennis balls have always seemed to have a more greenish tint (to me) than other brands (Dunlop, Wilson, Gamma, etc.), but across the board, the intended color is Optic Yellow.
They literally switched from white/grey to yellow in the 70’s to make them more visible on television screens … given that decision, why would they make them the same color as the grass or painted concrete?