Multi-layer core golf ball having opposing hardness gradient with steep gradient outer core layer

A golf ball comprising:

• an inner core having a first outer surface and a geometric center and being formed from a first substantially homogenous composition throughout such that the geometric center has a hardness of 56 to 80 Shore C and the first outer surface has a hardness of 50 to 75 Shore C;
• an outer core layer disposed about the inner core, the outer core layer having a second outer surface having a hardness of 85 to 98 Shore C and an inner surface having a hardness of 68 to 78 Shore C and being formed from a second substantially homogenous rubber composition throughout, the rubber composition comprising a base rubber and a resorcinol;
• and
• a cover layer disposed about the outer core layer;
• wherein the geometric center, the first and second outer surfaces, and the inner surface each have a hardness, the hardness of the second outer surface being greater than the hardness of the inner surface to define a positive hardness gradient of greater than 15 Shore C, and the hardness of the first outer surface being lower than the hardness of the geometric center to define a negative hardness gradient of −6 Shore C or greater.