abstract aged aging background brown chemical corroded corrosion damage damaged dirty distressed ferrous frame grunge grungy hull industrial industry iron macro metal metallic old oxidation oxide paint peel peeling pitted plate reaction red retro rough rust rusted rusty scrap stain stained steel texture urban weathered weathering blank door frame frames hang house name screw sign steal wall copyspace decay faded scratched yellow grate grates manhole pile sewer stock stockpile textures