lime and calcium carbonate escaping from concrete

abstract aged architecture back background blank building calcium carbonate cement chalk city color colorful colors concrete crack cracked cracks damaged dark deco detail details dingy dirty discolor discoloration downtown drain draining entrance escape escaping exterior grade graphic grunge grungy leech leeching lime lonely old outdoor outside peel pipe red retro rough rustic scene shadow shadows side sidewalk split stain stained stark step steps streak streaked streaking street structure style surface texture textured urban vintage wall worn