"Examples of the undercoating layer include polyamides such as nylon 6, nylon 66, nylon 11, nylon 610, copolymeric nylon, alkoxymethylated nylon, etc., casein, polyvinylalcohol, nitrocellulose, ethylene-acrylic acid copolymer, gelatine, polyurethane, polyvinylbutyral, and metal oxides such as aluminum oxide, etc." . . . .