1、Designation: D5398 97 (Reapproved 2010)Standard Practice forVisual Evaluation of the Lightfastness of Art Materials bythe User1This standard is issued under the fixed designation D5398; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisio
2、n, 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 This practice covers a method for exposing specimensof colored art materials indoors to sunlight coming
3、 through aclosed window. Any color change is compared to fading in aBlue Wool Reference2and exposed simultaneously.1.2 This practice shall only be used by individuals to selectmaterials with satisfactory lightfastness for their own use or toidentify materials that require special protection from lig
4、ht.When test information is to be communicated to others, TestMethods D4303 or Practice D5383 must be used.1.3 This practice may be used to indicate art materials thatwill change color within a few months or years in normalindoor exposure and those that will remain unchanged for aperiod of years. It
5、 is not rigorous enough to verify thatmaterials will remain unchanged for more than fifty years in ahome or office environment. A major consideration in devel-oping this method was to keep it simple and short enough to beperformed without instrumentation in a comparatively shortlength of time.1.4 Th
6、is practice is not suitable for evaluating the lightfast-ness of materials with a high oil content such as artists oil,resin-oil or alkyd paints.1.5 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.6 This standard does not pur
7、port to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:3D4
8、303 Test Methods for Lightfastness of Colorants Used inArtists MaterialsD5383 Practice for Visual Determination of the Lightfast-ness of Art Materials by Art TechnologistsE284 Terminology of Appearance2.2 Other Standards:ISO/R 105-B Textiles Tests for Colour Fastness Part B:Colour Fastness to Light
9、and Weathering4British Standards Institute (BSI) 1006 Group B Methods forColour Fastness of Textiles and Leathers53. Terminology3.1 The definitions included in Terminology E284 are ap-plicable to this practice.3.2 Definitions of Terms Specific to This Standard:3.2.1 bloom, na cloudy coating, sometim
10、es appearing oncolored pencil drawings due to migration of wax to the surface,that can be made transparent by gentle polishing.3.2.2 fugitive color, ncolorant that changes color in a fewdays or weeks, or that bleaches white in less than 18 months,when exposed behind glass to sunlight.3.2.3 glazing,
11、nthe transparent glass or plastic sheetplaced in front of a picture when it is framed.3.2.4 substrate, nthe white, pH neutral paper or board onwhich the art materials are applied.4. Summary of Practice4.1 This practice employs as a control Blue Wool Reference3 from the series of eight Blue Wool Refe
12、rences of knownlightfastness that were developed for use with ISO/R 105-B4and BSI 1006 Group B.51This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.57 on Artist Paints and Related
13、 Materials.Current edition approved June 1, 2010. Published July 2010. Originally approvedin 1993. Last previous edition approved in 2003 as D5398 97 (2003). DOI:10.1520/D5398-97R10.2ISO Blue Wool Reference 3 is available from the Society of Dyers andColourists, P.O. Box 244, Grattan Road, Radford,
14、West Yorkshire, BD12 JB,England, or as the third band from the top of the Textile Fading Card from Talas,Division of Technical Library Service, Inc., 213 West 35th St., New York, NY10001-1996.3For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at ser
15、viceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.4ISO/R 105-B is available from American National Standards Institute (ANSI),25 W. 43rd St., 4th Floor, New York, NY 10036, http:/www.ansi.org.5British Standard 1006 Grou
16、p B is available from British Standards Institute(BSI), 389 Chiswick High Rd., London W4 4AL, U.K., http:/www.bsi-.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.2 Specimens are made of the colored materials to be testedand placed
17、 on a backing board along with Blue Wool Refer-ence #3 or a Blue Wool Reference Card containing all eightBlue Wool References.4.3 One half of each colored specimen and one half of theBlue Wool References are covered, shielding that half of thespecimens and references from light. The test specimens a
18、ndreference are exposed to sunlight coming through a closedwindow.4.4 The test is complete when Blue Wool Reference #3fades a specific amount.4.5 The artist examines the test specimens and decideswhich materials are suitable for use in his or her works of art.NOTE 1Depending on the test location, th
19、e time of year, and thenumber of cloudy days, it will take from a few days to two months ofexposure in a window facing south to reveal fugitive materials that willeither bleach white or radically change color in a few years whendisplayed in a normal home environment. It will take from 4 to 18 months
20、of exposure to determine materials that will show, under normal roomconditions, various degrees of color change, and those that will remainunchanged for a long period of time.5. Significance and Use5.1 Artists have available to them a wide variety of artmaterials such as markers, colored pencils, pa
21、stels, coloredinks and airbrush colors. Many of these materials are manu-factured for temporary artwork and may contain pigments anddyes that fade in a relatively short time. Product labels andmanufacturers literature do not always supply the informationnecessary to distinguish products that are sta
22、ble to light fromthose that are not. This practice makes it possible for an artistto check the lightfastness of coloring materials to be used inworks of art. It may also be used to test the lightfastness ofother types of colored materials.6. Materials6.1 Backing Panel, that is resistant to warping w
23、hen placedon its edge and exposed to light and heat passing throughwindow glass. Foam core board, particle board, hardboard, orplywood are suitable.6.2 Substrate, of stiff drawing paper or museum board thatis white, acid free (pH 7 to 9), and of medium weight, 33 to 64kg (72 to 140 lb ). Depending o
24、n the material being tested, a pHneutral foam core board may be suitable. It is desirable for thesurface of the substrate to be similar to that customarily usedwith the materials being tested; however, it must be possible tocompletely cover the substrate with an even coat of the colors.Rough waterco
25、lor papers are not suitable.6.3 Blue Wool Reference 32, a horizontal band of blue woolcloth, 9.5 mm (38 in.) high and 44.5 mm (134 in.) wide, gluedto a card 2.5 by 4.4 cm (1 by 134 in.). If the Textile Fading Cardfrom Talas is used, Reference 3 is the third band down from theend of the card with the
26、 narrower margin and brighter bluewool bands. Either card must be kept in complete darknessuntil time for the test. It should be wrapped in an opaquecovering and stored in a drawer at normal room temperature.6.4 Colored Art Materials, to be tested.6.5 Specimen Cover, made from stiff material such as
27、 heavygage aluminum; stainless steel; stiff, opaque plastic; or woodenstrips. This cover shall be at least 32 mm (114 in.) wide and aslong as the backing panel. It is used to protect one half of eachart material specimen and one half of the Blue Wool Referencefrom light (see Fig. 1). The side of the
28、 cover that touches theart material specimens should be chemically inert to preventinteraction with, or migration of substances onto the testspecimens.6.6 Tape, to fasten the specimen support to the backingboard and to fasten the specimen cover over the specimens andthe Blue Wool Reference. Duct or
29、electrical tape is suitablesince it is designed to withstand heat.6.6.1 OptionalMetal Clamps, To hold the cover moretightly against the specimen. This will exclude light better,making a sharper edge between the exposed and unexposedsections of the specimens. This will make visual determina-tions eas
30、ier.6.7 Mask, shall be made of stiff paper with a slot, 6.4 by41.3 mm (14 by 158 in.), slightly smaller than the Blue WoolReference (see Fig. 2). Both sides of the mask shall be a neutralgray approximately Munsell Value 6.5. Side one shall have twoblue color chips attached above the slot. One blue c
31、hip shall beMunsell 7 PB 4/13, matching the unexposed Blue WoolReference #3. The second chip shall be Munsell 5 PB 6/4, thecolor of the exposed half of Blue Wool Reference #3 when thetest is complete. When the blue chips on Side 1 match theexposed and unexposed halves of Blue Wool Reference 3, thete
32、st is complete. The gray Side 2 is used to isolate a specimenwhen looking for a color change to prevent color changes inneighboring specimens from affecting the decision.NOTE 11 in. = 25.4 mm (exact).FIG. 1 Suggested Layout for Lightfastness Test PanelD5398 97 (2010)27. Preparation of Specimens7.1 C
33、ut both the heavy drawing paper to be used as thesubstrate and the backing panel to the size of the window inwhich the panel will be placed for exposure. Leave enoughspace around the panel to prevent shadows of the windowframe from falling across the specimens or the Blue WoolReference.7.2 Use Fig.
34、1 as a general guide in preparing the substrateon which to apply the art materials. The horizontal bands forthe art materials must be at least 9.5 mm (38 in.) high and 44.5mm (134 in. ) wide for each art material to be tested. This is thesame size as Blue Wool Reference #3.7.2.1 Above and below the
35、horizontal specimen bands putguide marks at the midpoint of the bands to guide theplacement of the cover. Do not draw a vertical line across thespecimen bands between these guide marks. When placed onthese guide marks, the cover will block light from half of eachspecimen and the standard.7.2.2 Apply
36、 the art materials so that each horizontal band iscompletely and consistently covered with a strong color. It maybe necessary to use more than one coat of a watercolor or inkto produce a color in which small amounts of fading can bedetected visually.7.2.3 At the top of the substrate record the type
37、of material,name of the manufacturer, and product line. Record the datethe test begins, leaving a space to record the date when theBlue Wool Reference #3 begins to fade, and the date when thetest is complete (see Fig. 1).7.2.4 Beside each specimen identify the art material ascompletely as possible.
38、Record the product number and thename of each material, if available.7.3 Use tape to attach the Blue Wool Reference card by itstop and bottom margins to the substrate. Center the Blue WoolReference directly below the center of the bands of art materialspecimens. The reference must be in line with th
39、e specimens soit will also be half covered when the cover is attached. Aseparate Blue Wool Reference card shall be included with eachset of test specimens that will be exposed in a different window.7.4 Attach the substrate containing the specimens and thereference to the backing board with the tape.
40、7.5 Line up the cover with the guide marks and fasten ittightly over the specimens and the Blue Wool Reference withtape or clamps. Tape may need to be replaced during theexposure period due to deterioration.8. Procedure8.1 Position the prepared panel in a window. In the northernhemisphere, the windo
41、w should face south or southwest ifpossible. This will shorten the time required for completion ofthe test. Tests will be completed sooner in the summer than inthe winter, and the altitude and latitude of the site will alsoaffect the time required for the test. If the specimens can beplaced at an an
42、gle, normally 45, in the window so the sun fallsdirectly on the specimens, this also speeds the results. Ensurethat no shadows fall across the specimens.8.2 Record the date exposure begins.8.3 Remove the cover once a week, isolate the Blue WoolReference #3 with the gray Side 2 of the Mask and check
43、thereference for any color change.8.3.1 Viewing ConditionsWhen visually examining theBlue Wool Reference #3 or the test specimens, the light sourceshall be natural sky light (not direct sun light), or an artificialdaylight source of 5000 to 7500 K with a Color RenderingIndex6of 89 or higher. If the
44、source is overhead, the specimensshall be held at about 45 from the horizontal to avoidreflections of the source on their surfaces.8.4 When a color difference can be seen between theexposed and unexposed halves of the Blue Wool Reference #3,use the gray Side 2 of the Mask to isolate each art materia
45、lspecimen in turn to check it for color changes.8.5 Record the date and the materials that show a colorchange.8.6 Reattach the specimen cover and continue exposure.8.6.1 Check the Blue Wool Reference #3 periodically (usu-ally about once a month is sufficient) by removing the coverand comparing the e
46、xposed and unexposed halves of thereference with the blues on Side 1 of the Mask. The darker bluechip matches approximately the unexposed Blue Wool Refer-ence #3.8.6.2 Place the slot in the mask so that the dark blue chiptouches the unexposed half of the Blue Wool Reference #3 andthe lighter blue ch
47、ip touches the exposed half of the reference.8.6.3 When the exposed half of the Blue Wool Reference #3matches the lighter blue chip the test is complete. Remove thepanel from exposure.8.7 Isolate each color specimen with the gray Side 2 of theMask and decide which materials have changed color suffi-
48、ciently to make them unsuitable for use in a permanentartwork, or which materials need added protection from lightand ultraviolet radiation (see Note 3).8.7.1 If the materials exposed were colored pencils, checkthe specimens that have appeared to change color for bloom,by rubbing them gently with a
49、small piece of cotton. If thespecimens color returns to its original appearance, the speci-men has not faded.8.8 Record the date and the materials that are deemedsuitable for use. It is useful to prepare a record such as the one6Color Rendering Index for a lamp may be obtained from the distributor ormanufacturer of that lamp.NOTE 1Side 2 is the same gray.FIG. 2 Side 1 of the Gray Mask Showing the Slot and Two BlueColor ChipsD5398 97 (2010)3shown in Fig. 3, noting the materials that have not changedcolor, those that show a small color change, thos
