A golf ball includes at least a core, an inner cover, and an outer cover. The inner and outer covers are of different colors. A portion of the inner cover penetrates the outer cover and is exposed to the outside on the surface of the golf ball. The exposed portion constitutes a mark portion on the surface...http://www.google.fr/patents/US6575847?utm_source=gb-gplus-shareBrevet US6575847 - Golf ball and method of manufacturing the same
