signs of food spoilage

• change in colour
• changes in texture - wrinkly, slimy, lumpy, hard, sloppy
• visible mould
• unpleasant odour - sour, bitter, sharp
• changes in flavour - sour, rancid, acidic, unpleasant
• Blown'cans and jar lids - spoilage microorganisms have produced gascausing the can or jar lid to 'blow'.