close up black chalk board with scratches and scuffs from white chalk for background.abstract, aged, ancient background, antique, artistic background, backdrop, billboard, black, black abstract, black board, blackboard, blank, board, canvas, chalk, chalk board, chalkboard, class, communication, cool, dark, dirty, distressed, distressed background, education, effect, empty, frame, grey, grunge, grunge wall, grungy, horror, macro, message, messy, old, old signboard, paint,school board, surface, texture,