【SomewonderfullycreativeusesofX-rayshavebeenintheworldofart.Butthemostimpressiveoneistouncoverwhathasbeencoveredup.DetailsunfoldedbyanX-rayofapaintingcan'tbeseenanyotherway.Forexampleinthepast】
SomewonderfullycreativeusesofX-rayshavebeenintheworldofart.Butthemostimpressiveoneistouncoverwhathasbeencoveredup.DetailsunfoldedbyanX-rayofapaintingcan'tbeseenanyotherway.Forexampleinthepastpaintingswereoftenrepairedifsmallpiecesofpaintfelloffthecanvas(帆布).Theserepairscannotbeseenjustbylookingatthepainting.IttakesanX-raytodiscoverwheretherepairshavebeenmade.
AnX-rayofapaintingisoneofthebestwaystotellifitwascreatedbyafamouspainterorifitisaforgery(赝品).IfthereisaquestionastowhetheranoldmasterhaspaintedacertainpaintingornotX-raysaremadeandcomparedtothoseofpaintingsthatareknowntobeoriginal.Ifthebrushstrokes(笔迹)forexampleareshowntobetotallydifferentthaninotherworkdonebyacertainartistthenthepaintingisprovedtobeafakecopy.
SincemodernpaintsareusuallymadefromdifferentmaterialsthanpaintsofhundredsofyearsagotheimagetheyleaveonanX-rayfilmlooksdifferent.ThisisanotherwayX-rayscanbeusedtospotaforgery.Amodemartistwilltrytomakeaforgerylookhundredsofyearsoldbypaintingdirtyvarnishonitorbyusingartificialmeanstogetthevarnishtolookcracked.TothenakedeyetheforgerymaylookoldbutwhenacarefulstudyoftheX-rayimageismadethedeceptionisobvious.
Itwascommonmanyyearsagoforanartisttofinishapaintingdecideitwasn'tanygoodandpaintacompletelydifferentpictureontopofit.Orartistswouldpaintoverothers'work—itwastheirversionofrecycling.TakinganX-rayistheonlywaytofindoutifthereisapictureunderneaththepictureyouseewithyoureyes.Sometimesmuseumswillbemoreinterestedinthepaintingbeneaththantheoneontopandwillrestoretheolderonebyhavingthetoplayerpainstakinglyremoved.
1.Whatisthemainpurposeofthearticle?
A.Toprovideinformationtopolicewhoarelookingforstolenart.
B.Topersuadeartdealerstocheckforfakecopiesbeforesellingart.
C.Toexplainhowmoderntechnologycanbeappliedinuniqueways.
D.Tohelpartistsrestoredamagedartworktoitsoriginalappearance.
2.Accordingtothepassage,X-raysareusedto______.
A.makerepairsonpaintingsinthepast
B.ident