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1、Designation:D1729?96(Reapproved2009)StardPracticefVisualAppraisalofColsColDifferencesofDiffuselyIlluminatedOpaqueMaterials1ThisstardisissuedunderthefixeddesignationD1729thenumberimmediatelyfollowingthedesignationindicate

2、stheyearofiginaladoptioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.Thisstardhasbeenapprovedfusebyag

3、enciesoftheDepartmentofDefense.INTRODUCTIONThecolsofmaterialsdependonthegeometricspectralnatureoftheilluminatingviewingconditions.Thispracticespecifiesstardconditionsfappraisingthecolscoldifferencesofopaquespecimensthata

4、rediffuselyilluminated.Daylightthenaturalilluminantisusuallyofprimaryinterestbutnaturaldaylightishighlyvariableisnotavailableatnightininteriroomssosimulateddaylightisgenerallyused.Colsmaymatchunderalightsourcewithonespec

5、tralpowerdistributionbutnotunderanothersothematchisusuallyconfirmedunderanotherverydifferentsource.Anincescentlampoflowcrelatedcoltemperaturehaslongbeenusedtodetectmismatcheslikelytoappearunderyellowerphasesofdaylightinc

6、escentlight.Industrialcolmatchersoftenverifythematchwiththekindoflightlikelytobefoundwheretheproductissoldused.Judgmentsmustbemadebyobserverswithnmalcolvision.Evensotheremaybesubstantialindividualdifferencesinjudgments.1

7、.Scope1.1Thispracticespecifiestheequipmentproceduresfvisualappraisalofthecolscoldifferencesofopaquematerialsthatarediffuselyilluminated.Thesespecificationareofcriticalimptanceincolmatching.Thispracticerequiresjudgmentsby

8、observerswithnmalcolvision.1.2Criticalvisualappraisalofcolscoldifferencesofmaterialssuchasmetallicpearlescentpaintsrequiresilluminationthatisnearlyageometricsimulationofsunlightbecausesuchdirectionalilluminationpermitsob

9、servationoftheglittergoniochromatismthatacterizesuchmaterials.Suchviewingconditionsarebeyondthescopeofthispractice.1.3ThevaluesstatedinSIunitsaretoberegardedasthestard.Thevaluesgiveninparenthesesarefinfmationonly.1.4This

10、starddoesnotpurpttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.2.Refer

11、encedDocuments2.1ASTMStards:2D523TestMethodfSpecularGlossD1535PracticefSpecifyingColbytheMunsellSystemD4086PracticefVisualEvaluationofMetamerismD5531GuidefPreparationMaintenanceDistributionofPhysicalProductStardsfColGeom

12、etricAppearanceofCoatingsE284TerminologyofAppearanceE308PracticefComputingtheColsofObjectsbyUsingtheCIESystemE1164PracticefObtainingSpectrometricDatafObjectColEvaluationE1499GuidefionEvaluationTrainingofObservers1Thispra

13、cticeisunderthejurisdictionofASTMCommitteeE12onColAppearanceisthedirectresponsibilityofSubcommitteeE12.11onVisualMethods.CurrenteditionapprovedDec.12009.PublishedDecember2009.iginallyapprovedin1960.Lastpreviouseditionapp

14、rovedin2003asD1729–96(2003).DOI:10.1520D1729–96R09.ThisstardhasbeenapprovedfusebyagenciesoftheDepartmentofDefensetoreplaceMethod4249.1ofFederalTestMethodStardNo141.ConsulttheDoDIndexofSpecificationsStardsfthespecificyear

15、ofissuewhichhasbeenadoptedbytheDepartmentofDefense.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactASTMCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsit

16、e.Copyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates1specimens.Theilluminanceshallbeunifmovertheviewingareawithin620%withnoabruptchangesapparenttotheobserver.6.1.4SurroundAmbient

17、Field—ThesurroundtheptionofthevisualfieldimmediatelysurroundingthespecimensshallbethecolhavingtheMunsellnotationgiveninTable1ftheevaluationcategyinvolved.Theambientvisualfieldthefieldofviewseenwhentheobserverglancesawayf

18、romthespecimenssuchastheinterisurfacesofaviewingbooththenearbywallsofaviewingroomshallbethecolhavingtheMunsellnotationgiveninTable1ftheevaluationcategyinvolved.6.1.4.1Theglossofthesurroundtheambientfieldshallbenogreatert

19、han15onthe60glossscaledescribedinTestMethodD523.6.1.4.2Whenglossyhighlysaturatedspecimensarecompareditisimptanttoavoidobservinglightspecularlyreflectedbythem.Blackvelvetothermatteblackmaterialshouldbeplacedintheambientfi

20、eldsoitsdarkimageisreflectedbythespecimens.6.2AvailabilityofApparatus:6.2.1Equipmentmeetingtherequirementsofthispracticeiscommerciallyavailable.Themostimptantrequirementwhichisofparticularimptancefdaylightsimulatsisthesp

21、ectralpowerdistributionoftheillumination.6.2.2Commerciallyavailableilluminationmetersmaybeusedtomeasurethephotometricconditions.6.2.3PaintfthesurroundtheambientfieldmaybespecifiedbytheMunsellnotationsgiveninTable1.6.2.4C

22、ommerciallyavailablespectradiometersmaybeusedtomeasurethespectralpowerdistributionstheCIEmethodofcomputationmaybeaccomplishedwithapersonalcomputer.6.3MaintenanceofApparatus—Lampsotherapparatusmustbemaintained.Atleastonce

23、duringeach100hofusechecktheapparatusinthefollowingway:6.3.1Replacedarkenedburnedoutlampsbesurethatalllampsareoperating.6.3.2Cleanthefixturessodustfilmsdepositedfromtheatmospheredonotalterthespectralpowerdistributions.6.3

24、.3Measurerecdilluminationlevels.7.PreparationofSpecimens7.1Specimenpreparationifanyshouldbefullydescribedinthespecificationfthematerialreferenceshallbemadetoastardmethodofpreparation.Specimensshouldbeplanarunifmincolglos

25、scleanfreeofdefectsrepresentativeofthebatch.Fmaximumprecisionincoldifferenceevaluationthespecimensshouldhavethesameglosstexture.Thisfactshouldbeconsideredinadoptingaphysicalcolstardtobematched(seeGuideD5531PracticeE1164)

26、.7.2Thepreferredsizeofspecimensisapproximately90by165mm(31?2by61?2in.).Ifsmallersizesareusedtheprecisionmaybereduced.8.Procedure8.1IlluminationViewing—Placethematerialsonatablethebottomofaviewingboothatthedistancefromthe

27、illuminatrequiredtoobtainthespecifiedilluminance.Thematerialsshouldbeplacedinthesameplaneinedgecontactagainsttheappropriatesurroundmaterial.Thespecimensshouldbeviewedatadistanceof450to600mm(18to24in.).8.2Whenviewingaglos

28、sysurfaceitisnecessarytoavoidseeingthelightsourcespecularlyreflectedbythesurface.Thismaybeaccomplishedbyilluminatingalongthenmaltothesurfaceviewingat45Ctothenmalilluminatingat45viewingalongthenmal(see6.1.4.2).8.3Mattespe

29、cimensshouldbeviewedalongtheirnmal(directlyfacingtheobserver)whileilluminatedatapproximately45tothenmal.8.4Somekindsofspecimenspresentdifferentcolswhentheilluminatingviewinggeometryarechanged.Todetectthiseffecteachtypeof

30、specimenshouldbeexaminedwhilevaryingtheviewingangleoverawiderange.Ifthiseffectispresentagoodcolmatchisrequiredthespecimensmustmatchoverthiswiderangeofangles.Thespecimensmustbeheldinthesameplaneasthatplaneisvariedrelative

31、tothesourceobserver.8.5Averysmallcoldifferenceofayellowbluekind(asopposedtoaredgreenkind)suchasthatinvolvedinjudgingtheyellownessofnearlywhitematerialsmaybeperceivedmereadilyifthetwospecimensarevisuallyseparatedbyaveryfi

32、neblacklinesuchasablackthread.8.6LightSources—Ifotherwiseidenticalspecimenshaveidenticalreflectionfluescencespectratheywillmatchunderanylightsource.Oftenthespectraarenotthesameamatchunderonelightsourcedoesnotensureamatch

33、underothers.Thisphenomenoniscalled“metamerism”(seeTerminologyE284E284).Totestfmetamerismspecimensareusuallycomparedunderdaylightatleastoneothersource.Theothersourcemaybeanincescentlampothersourcelikelytobefoundwherethema

34、terialissoldused.Thesourcestobeusedareoftenspecifiedinpurchaseagreements(seePracticeD4086).8.7EvaluationofColDifference—Observecoldifferencecomponentsofhuelightness(value)saturation(chroma)withanindicationofthederofpromi

35、nenceofthesecomponents.Fexampleitmightbenotedthataredspecimenismoderatelyyellowerslightlydarkerveryslightlylesssaturatedthanthegivenstard.Fcriticalevaluationinterchangethematerialsrepeattheevaluation.Meprecisemethodology

36、isdescribedinPracticeD1535.9.Rept9.1Reptthefollowinginfmation:TABLE1ColofSurroundAmbientFieldAEvaluationCategyColofSurroundColofAmbientFieldMaximumMunsellChromaofNeutralsCriticalsimilartostardN6toN70.2GeneralN5toN7N6toN7

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