A method of making a rotary wing aircraft bearing to provide a constrained relative motion between a first rotary wing aircraft member and a second rotary wing aircraft member, said method including: providing a plurality of nonelastomeric shim members, providing a plurality of elastomeric shim member layers, bonding said nonelastomeric shim members and said elastomeric shim member layers together to provide an alternating laminated bearing stack with said exterior elastomer region exterior of said interior elastomer region, said exterior elastomer region proximate an exterior surface of said alternating laminated bearing stack, characterized by at least one of said elastomeric shim member layers comprised of an interior elastomer region, said interior elastomer region comprised of an interior cured elastomer composition having at least a first interior optical characteristic ingredient, and an exterior elastomer region, said exterior elastomer region comprised of an exterior cured elastomer composition having at least a second exterior optical characteristic ingredient, said at least a second exterior optical characteristic ingredient different than said interior elastomer composition first interior optical characteristic ingredient, said exterior elastomer region disposed out from said interior elastomer region, wherein with an elastomer void crack propagating from said exterior surface inward towards said interior elastomer region, a repeated rotary wing aircraft relative motion between said first rotary wing aircraft member and said second rotary wing aircraft member generates a plurality of interior cured elastomer composition crumbs to be expelled from said elastomer void crack, said interior cured elastomer composition crumbs optically distinguishable from said exterior elastomer composition. providing a plurality of nonelastomeric shim members, providing a plurality of elastomeric shim member layers, bonding said nonelastomeric shim members and said elastomeric shim member layers together to provide an alternating laminated bearing stack with said exterior elastomer region exterior of said interior elastomer region, said exterior elastomer region proximate an exterior surface of said alternating laminated bearing stack, characterized by at least one of said elastomeric shim member layers comprised of an interior elastomer region, said interior elastomer region comprised of an interior cured elastomer composition having at least a first interior optical characteristic ingredient, and an exterior elastomer region, said exterior elastomer region comprised of an exterior cured elastomer composition having at least a second exterior optical characteristic ingredient, said at least a second exterior optical characteristic ingredient different than said interior elastomer composition first interior optical characteristic ingredient, said exterior elastomer region disposed out from said interior elastomer region, wherein with an elastomer void crack propagating from said exterior surface inward towards said interior elastomer region, a repeated rotary wing aircraft relative motion between said first rotary wing aircraft member and said second rotary wing aircraft member generates a plurality of interior cured elastomer composition crumbs to be expelled from said elastomer void crack, said interior cured elastomer composition crumbs optically distinguishable from said exterior elastomer composition.