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Bruises can happen for many reasons, but most are the result of bumping and banging into things — or having things bump and bang into you.
Fortunately, as anyone who's ever sported a shiner knows, the mark isn't permanent. Over that time, the bruise changes color as the body breaks down and reabsorbs the blood.
Yajima and Funayama (2006) analysed bruising in the living using both tristimulus and spectrophotometric measurement, and indicated that single readings were so variable as to be meaningless, but that multiple readings over a series of days showed some promise as a quantitative method of analysing bruises (enabling allocation of bruises to 'recent', 'older', or 'nearly healed' groupings).Another trick is to use a bag of frozen vegetables.