Designation:C1650−14StandardPracticeforInstrumentalReflectanceMeasurementofColorforFlatGlass,Coated,andUncoated1ThisstandardisissuedunderthefixeddesignationC1650;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeprovidesguidelinesfortheinstrumentalreflectancemeasurementofthecolorofflat,coatedanduncoatedglass.SeeTerminologyE284.1.2Thepracticespecificallyexcludesfluorescentandiri-descentsamples.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D2244PracticeforCalculationofColorTolerancesandColorDifferencesfromInstrumentallyMeasuredColorCoordinatesE284TerminologyofAppearanceE179GuideforSelectionofGeometricConditionsforMeasurementofReflectionandTransmissionPropertiesofMaterialsE308PracticeforComputingtheColorsofObjectsbyUsingtheCIESystemE1164PracticeforObtainingSpectrometricDataforObject-ColorEvaluationE1331TestMethodforReflectanceFactorandColorbySpectrophotometryUsingHemisphericalGeometry2.2CIEStandard:3CIE15:2004Colorimetry,ThirdEdition3.SummaryofPractice3.1Thereflectedcolorofglassproducts,(seeGuideE179)ismeasuredinreflectancespecularincludedmodeonaCIE-conformingdiffusegeometryinstrument.(SeeTestMethodE1331andCIE15:2004.)TheglasscolorisexpressedinCIEtristimulusvaluesbasedonspectraltransmittancemeasurementsoverthefullCIEspectralrangeof350–780nmwithamaximum10-nmbandpass.(SeeCIE15:2004andPracticeE308.)Forcolormeasurement,useofatruncatedspectralrangeof400–700nmisacceptable.(SeeCIE15:2004.)FurtherinformationontheU...
