ASTM_D_4303_-_10.pdf

Designation:D430310Standard Test Methods forLightfastness of Colorants Used in Artists Materials1This standard is issued under the fixed designation D4303;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 Four test methods to accelerate the effects of long termindoor illumination on artists materials are described below.One of the natural daylight methods and one of the xenon-arcmethods are used to categorize the lightfastness of colorants.1.1.1 Test Method AExposure in southern Florida tonatural daylight filtered through window glass.1.1.2 Test Method BExposure in Arizona to natural day-light filtered through window glass.1.1.3 Test Method CExposure in a non-humidity con-trolled xenon-arc device simulating daylight filtered throughwindow glass.1.1.4 Test Method DExposure in a humidity controlledxenon-arc device simulating daylight filtered through windowglass.1.2 These test methods are used to approximate the colorchange that can be expected over time in colorants used inartists materials exposed indoors to daylight through windowglass.NOTE1The color changes that result from accelerated exposure maynot duplicate the results of normal indoor exposure in a home,art gallery,or museum.The relative resistance to change,however,can be establishedso colored materials can be assigned to categories of relative lightfastness.NOTE2Users who wish to test colored materials under fluorescentillumination should consult Practice D4674.1.3 Lightfastness categories are established to which colo-rants are assigned based on the color difference betweenspecimens before and after exposure.1.4 Color difference units are calculated by the CIE 1976L*a*b*color difference equation.1.5 These test methods apply to colored artists materials.1.6 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.7 This standard does not purport to address the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D2244 Practice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesD4302 Specification for Artists Oil,Resin-Oil,and AlkydPaintsD4674 Practice forAccelerated Testing for Color Stability ofPlastics Exposed to Indoor Office EnvironmentsD5067 Specification for Artists Watercolor PaintsD5098 Specification for Artists Acrylic Dispersion PaintsD5724 Specification for Gouache PaintsD6901 Specification for Artists Colored PencilsE284 Terminology of AppearanceE1347 Test Method for Color and Color-Difference Mea-surement by Tristimulus ColorimetryE1348 Test Method for Transmittance and Color by Spec-trophotometry Using Hemispherical GeometryE1349 Test Method for Reflectance Factor and Color bySpectrophotometry Using Bidirectional(45:0 or 0:45)GeometryG24 Practice for Conducting Exposures to Daylight FilteredThrough GlassG113 Terminology Relating to Natural and Artificial Weath-ering Tests of Nonmetallic MaterialsG141 Guide for Addressing Variability in Exposure Testingof Nonmetallic MaterialsG151 Practice for Exposing Nonmetallic Materials inAccel-erated Test Devices that Use Laboratory Light SourcesG155 Practice for Operating Xenon Arc Light Apparatus forExposure of Non-Metallic Materials3.Terminology3.1 DefinitionsAppearance terms used in these test meth-ods are defined in Terminology E284.Terms relating to natural1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings,Materials,and Applications and are the directresponsibility of Subcommittee D01.57 on Artist Paints and Related Materials.Current edition approved June 1,2010.Published June 2010.Originallyapproved in 1983.Last previous edition approved in 2006 as D4303 06.DOI:10.1520/D4303-10.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 and artificial lightfastness tests are defined in TerminologyG113.3.1.1 glass,nas used in these test methods,glass refers tosingle-strength window glass.4.Summary of Test Method4.1 Color measurements are made on duplicate specimensthat have been prepared as directed in the specification for thatmaterial.Examples of specifications are:D4302,D5067,D5098,D5724,and D6901.Each contains colorants in adifferent vehicle.The measurements are recorded for compari-son with re