In these circumstances, it is not surprising that most of the glass fragments originate from end-use of the product rather than from its manufacture. This fact also explains why the numbers of complaints of glass fragments in food products remain stubbornly high. Whilst a food manufacturer can reasonably be expected to take measures to prevent glass fragments getting into food in the factory, he cannot control the way the product is used by the consumer. In contrast, much other foreign matter can be very effectively controlled by suitable measures within a food processing system, including metal detectors, X-ray machines and magnets, mechanical separation methods such as sieving, flotation and gravity separation, automatic vision systems and even visual inspection by factory staff.