analyse backdrop background bacteria blood blood analysis cells cleaning clusters color colour concept contamination culture disease disinfect Ebola germs graphic health health care illness immune immune system immunity infection medical medicine microbes microscopic mitosis pathogens petri dish probiotics red sample science sickness slides swab test texture tissue unclean virus abandoned aging agricultural appearances brown colors colours corroded corrosion damage damaged dark decay derelict deteriorating deterioration Dirt dirty discarded discoloration discolouration disrepair dumped equipment exposed farm farming iron lines machinery machines metal neglect neglected old orange rough rust rusty surface surfaces textures unwanted variety wearing weathered weathering cogwheels frozen gears rusted teeth turning abstract abstraction bark black branch branches bright christmas contrast contrasted darkness exposure free glow glowing illuminate illuminated illumination image light lights long photo photograph picture resource season seasonal somadjinn spark sparkle sparkles sparkling sparks stock textured tree violet white winter wood xmas yellow yule yuletide