ASTM_D_6901_-_15.pdf

Designation:D690115Standard Specification forArtists Colored Pencils1This standard is issued under the fixed designation D6901;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 Thisspecificationestablishesrequirementsforcomposition,performance,and labeling of artists coloredpencils.1.2 This specification covers vehicles and additives.Re-quirements are included for identification,lightfastness,andconsistency.1.3 Colored pencil specimens are exposed to both naturaldaylight through window glass and simulated window glass-filtered daylight radiation to determine the lightfastness ratingfor each pencil.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.2.Referenced Documents2.1 ASTM Standards:2D2244 Practice for Calculation of Color Tolerances andColor Differences from Instrumentally Measured ColorCoordinatesD4236 Practice for Labeling Art Materials for ChronicHealth HazardsD4303 Test Methods for Lightfastness of Colorants Used inArtists MaterialsE284 Terminology of AppearanceG24 Practice for Conducting Exposures to Daylight FilteredThrough GlassG113 Terminology Relating to Natural and Artificial Weath-ering Tests of 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 DefinitionsRefer to Terminology E284 for appearanceterms used in this specification and to Terminology G113 forterms relating to natural and artificial lightfastness tests.3.2 Definitions of Terms Specific to This Standard:3.2.1 bloom,na cloudy exudation on the surface ofcolored pencil due to wax migration.3.2.2 burnish,vto firmly rub the surface of the samplefollowing application of the colored pencil until the binderbreaks down and the color is forced into the texture of thesubstrate to improve coverage.3.2.3 colored pencil,na core of extenders,binders,pig-ments and additives,such as wax/oil and thickeners surroundedby a casing.3.2.4 color stick,na core of extenders,binders,pigmentsand additives,such as wax/oil and thickeners without a casingbut sometimes with a paper sleeve.3.2.5 substrate,nwhite,uncoated,neutral pH,bufferedpaper,or board,without optical brighteners,to which color isapplied.3.2.6 watercolor pencil,na colored pencil with a water-dispersible core.3.2.7 water-soluble color stick,na water-dispersible colorstick.4.Significance and Use4.1 This specification establishes quality requirements andprovides a basis for common understanding among producers,distributors,and users.4.2 It is not intended that all pencils meeting the require-ments be identical nor of uniform excellence in all respects.Variations in manufacture,not covered by this specification,may cause some artists to prefer one brand over another,eitherof which may be acceptable under this specification.4.3 Variation in test results can result from differences inpigment manufacture from time to time in a company,differentvarieties of a pigment from company to company,differentcombinations of pigments and other ingredients,specimenpreparation,different instruments and instrumental readings,variations in the surface of the specimen,and the conditions of1This specification is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.57 on Artist Paints and Related Materials.Current edition approved June 1,2015.Published June 2015.Originallyapproved in 2003.Last previous edition approved in 2006 as D6901 06 which waswithdrawn January 2015 and reinstated in June 2015.DOI:10.1520/D6901-15.2For 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 exposure.Allowance for these variations is made by establish-ing lightfastness categories,each of which covers a definedrange of color loss.4.4 Since a specific colored pencil may be unusually sensi-tive to some aspect of a particular method of acceleratedlightfastness testing and show a change in color that would notoccur in a normal home or gallery environment,two types ofexposure are required.4.5 Some variation in test results is to be expected evenwhen the same type of exposure is repeated;therefore,aftertriplicate specimens are exposed in each type of exposure,anyoutlier is discarded and the mean of the specimens is calculatedfor each exposure type to determi