| OCR Text |
Show Ultraviolet Ray Is IsUsed IsUsed Used in Selecting SelectingEggs SelectingEggs Eggs for StorageAmsterdam Storage StorageAmsterdam Amsterdam . . - Eggs can be bemade bemade bemade made to t-o t o - - tell the truthabout truth about abouttheIr abouttheir abouttheir theIr age by exposing them to toultravIOlet toultraviolet toultraviolet ultravIOlet light hght , it has been beendIscovered beendiscovered beendiscovered dIscovered at the University of ofUtrecht ofUtreclit ofUtrecht Utrecht Utreclit . . The trick tnck truck depends on the phe phe- phenomenon phenomenon - . nomenon nornenon known as fluorescence Ul- Ul UI- UI UltravIOlet UItraviolet Ul Ultraviolet - traviolet radiation is 1S itself ltsell invisIble invisibleto to the human ee e ) e , but it causes causesvarious causesvarious causesvarious various substances sub.stances . to shine sbme With WithlIght withlight withhght lIght of different colorsTo colorsTo colors colorsTo To the human eye an egg is just justan Justan justan an egg But under a beam of ultra- ultra ultravlolet ultra-violet ultra violet - . vlolet violet a really fresh laid egg glo\lS glo lS glos glolSWIth gloswith glowswith \ ; WIth a very pronounced red colora color3- color3 cobra color3bon coloration - . tion bon . . . Less freshly laid eggs shade shadeinto shadeinto shadeinto into blue . , and the older they are the thedeeper thedeeper thedeeper deeper is the blue Classified Classdied by Riy R\y R y ' \ . Investigators at the University ot of otUtrecht ofUtrecht ofUtrecht Utrecht first made use of this new newtool newtool newtool tool of the scientists to select eggs eggsfor eggsfor eggslor for storage . . A quantity quanhty of eggs were classifiedas class1fiedas class1fied classified as to age by ultraviolet and then thenplaced thenplaced thenplaced placed m in storage . After six months monthsnot monthsnot monthsnot not one of the "quite quite " freshly laid laid"eggs laideggs " eggs had to be discarded In an- an another another an another - other group identified identIfled by the ultra ultra- ultraviolet ultraviolet - . violet light as "freshly freshly " laid loud , , " 1 I per percent percent percent cent had to be thrown away when whenbrought whenbrought whenbrought brought out tor for use at the end of the theSIX thesix thesix SIX months . . In a third group of of"not of"not ofnot 'not not "not " " ' freshly laid " " eggs , 8 per centwere centwere cent centwere were discarded , and andn -n n .n . - . a fourth fourthgroup fourthgroup fourthgroup group , recognized recogmzcd at the begmnmg beginning beginningas begmnmgas as doubtful doubtu ! , 15 per pcr cent had to bc be bcrejected berijected berejected rejected rijected . |
