The FBC Corrosive Sign is a medium-sized, rectangular metal plaque with sharp, angular edges, embodying the brutalist architecture style of Control. Its surface is heavily weathered, featuring deep scratches and a corroded, oxidized patina that suggests exposure to harsh conditions. The sign is embossed with bold, sans-serif lettering warning of corrosive materials, with the text appearing slightly raised and painted in a faded yellow against the dark, metallic background. The edges are slightly warped, adding to the surreal, otherworldly aesthetic of the game.