WE Hill & Sons violin bow Posted on March 15, 2019May 17, 2019 by j aniano WE Hill & Sons violin bow tortoiseshell frog with extensive mite damage as presented. Tiny mites eat away at the material leaving rough voids. WE Hill & Sons violin bow tortoiseshell frog with tinted epoxy repair. Custom tinting of optical epoxy is used to fill the voids and match the surrounding untouched material. WE Hill & Sons violin bow tortoiseshell frog with extensive mite damage before repair. Tiny mites can do damage to natural tortoiseshell frogs and buttons. They eat away at the material leaving rough voids. WE Hill & Sons violin bow tortoiseshell frog with tinted epoxy repair. Custom tinting of optical epoxy is used to fill the voids and match the surrounding untouched material. I learned this method from Jerry Pasewicz.