Designation:C609−07(Reapproved2014)StandardTestMethodforMeasurementofLightReflectanceValueandSmallColorDifferencesBetweenPiecesofCeramicTile1ThisstandardisissuedunderthefixeddesignationC609;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethodcoversthemeasurementofLightReflectanceValue(LRV)andvisuallysmallcolordifferencebetweenpiecesofglazedorunglazedceramictile,usinganyspectrophotometerthatmeetstherequirementsspecifiedinthetestmethod.LRVandthemagnitudeanddirectionofthecolordifferenceareexpressednumerically,withsufficientaccuracyforuseinproductspecification.1.2LRVmaybemeasuredforeithersolid-coloredtileortilehavingamulticolored,speckled,ortexturedsurface.Fortilethatarenotsolid-colored,anaveragereadingshouldbeobtainedfrommultiplemeasurementstakeninapatternrepresentativeoftheoverallsampleasdescribedin9.2ofthistestmethod.Smallcolordifferencebetweentilesshouldonlybemeasuredforsolid-colortiles.Smallcolordifferencebetweentilethathaveamulticolored,speckled,ortexturedsurface,arenotvalid.1.3Forsolidcoloredtile,acomparisonofthetestspecimenandreferencespecimenshouldbemadeunderincandescent,fluorescentanddaylightilluminantconditions.Theuseofmultipleilluminantsallowsthecolordifferencemeasurementtobemadewithouttheriskofwronglyacceptingamatchwhenthetilesbeingcomparedaremetamers.(See3.1.4.)1.4Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Thevaluesgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C242TerminologyofCeramicWhitewaresandRelatedProductsD2244PracticeforCalculationof...
