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Developed in 1967 by AATCC CommitteeRA23; jurisdiction transferred in 1996 toAATCC Committee RA50; reaffirmed1971, 1974, 1978, 1989, 1991; revised1982, 2004 (with title change); editori-ally revised and reaffirmed 1986; edito-rially revised 1990, 1993, 1996, 2005
1. Purpose and Scope
1.1 The purpose of this method is todetermine the effect of the combinationof perspiration solution and light expo-sure on the colorfastness of a colored tex-tile specimen. Therefore, only perspira-tion solutions will be used in thisprocedure.
2.1 A colored test specimen is im-mersed in a perspiration test solution fora specified period of time and immedi-ately exposed to light in a fading appara-tus for a specified period of time.
2.1.1 Fading apparatus will be the xe-non-arc lamp test apparatus as describedin AATCC Test Method 16, Colorfast-ness to Light.
3.1 colorfastness, n.—the resistance ofa material to change in any of its colorcharacteristics, to transfer of its colo-rant(s) to adjacent materials or both, as aresult of the exposure of the material toany environment that might be encoun-tered during the processing, testing, stor-age or use of the material.
3.2 lightfastness, n.—the property of amaterial, usually an assigned number, de-picting a ranked change in its color char-acteristics as a result of exposure of thematerial to sunlight or an artificial lightsource.
3.3 perspiration, n.—a saline fluid se-creted by the sweat glands (in this test anartificial perspiration solution will beused).
4. Safety Precautions
NOTE: These safety precautions arefor information purposes only. The pre-cautions are ancillary to the testing proce-dures and are not intended to be all inclu-sive. It is the user’s responsibility to usesafe and proper techniques in handlingmaterials in this test method. Manufac-turers MUST be consulted for specificdetails such as material safety data sheets and other manufacturer’s recommenda-tions. All OSHA standards and rulesmust also be consulted and followed.
4.1 Good laboratory practices shouldbe followed. Wear safety glasses in alllaboratory areas.
5. Apparatus, Materials and Test Solutions
5.1 Xenon-arc lamp fading apparatus(see AATCC Method 16, Option 3)
5.2 Balance with a weighing accuracyof 0.01 g.
5.3 pH meter accurate to 0.01.
5.4 Cardboard: 41 kg (91 lb) WhiteBristol Index (no backing of exposed areaof colored test specimen) (see 12.1).
5.5 Acid perspiration solution.
5.6 Gray Scale for Color Change (see12.1).
5.7 Blotting paper (see 12.1).
6. Preparation of Reagent
6.1 Prepare the acid perspiration solu-tion by filling a 1 L volumetric flask halffull of distilled water. Add the followingchemicals and mix to be sure that allchemicals are thoroughly dissolved:10 ± 0.01 g sodium chloride (NaCl)1 ± 0.01 g lactic acid, USP 85% 1 ± 0.01 g disodium hydrogen phos-phate, anhydrous (Na2HPO4) (see 12.2)0.25 ± 0.001 g R-histidine monohydro-chloride (C6H9N3O2⋅HCl⋅H2O) Fill the volumetric flask with distilledwater to the 1 L mark.
6.2 Test the pH of the solution with a pHmeter. If it is not 4.3 ± 0.2 discard it andprepare a new one, making sure all ingre-dients are weighed accurately. The use ofpH test paper is not recommended for thispurpose because of its lack of accuracy.
6.3 Do not use perspiration solutionthat is more than three days old (see 12.3).
7. Test Specimens
7.1 Cut a specimen of colored fabric5.1 × 7.0 cm (2.0 × 2.75 in.).
8.1 Weigh the specimen to ± 0.01g.
8.2 Place each test specimen (as pre-pared in 7.1) in a 9 cm diameter, 2 cmdeep petri dish. Add freshly prepared per-spiration solution to a depth of 1.5 cm inthe petri dish. Soak the test specimen inthe solution for 30 ± 2 min with occa-sional agitation and squeezing to ensurecomplete wetting. For fabrics hard to wetout, alternately wet the specimen and pass through a laboratory wringer until itis completely penetrated by the solution.
8.3 Remove specimen from solutionand blot each specimen to remove excesssolution. Reweigh specimen to determine100 ± 5% wet pick up.
8.4 Mount wet, unbacked specimen inexposure frame or mount specimen onwater repellent backing and white cardstock.
8.5 Expose specimens in fading appa-ratus in accordance with AATCC 16, Op-tion 3 for 20 AFUs. 8.6 Remove the specimens.
9.1 Evaluation of color change.
9.2 The color change can be quantita-tively determined by measuring the colordifference between the unwashed sampleand a test specimen using a suitable colo-rimeter or spectrophotometer with theappropriate software (see AATCC Evalu-ation Procedure 7, Instrumental Assess-ment of the Change in Color of a TestSpecimen).
9.3 To evaluate the color change of thetest specimens visually, follow Evalua-tion Procedure 1, Gray Scale for ColorChange, using the Gray Scale for ColorChange. For improved precision and ac-curacy more than one rater should ratethe specimens.
10.1 Report the color change grade.
10.2 Report the Fading apparatus used.
11. Precision and Bias
11.1 Precision. In 2002 a single labora-tory study was performed using a singleoperator. This study was intended to be atemporary table of variances to give someindication of test variability. A completeinterlaboratory study is to be conductedin the near future for the purposes of pre-cision and bias. Table values do not re-flect different types of material tested tothis standard. Between-Laboratory vari-ability is not indicated either. Special careand consideration of the variances re-ported must be used when examining testvariability problems.
11.1.1 Samples tested consisted of fourfabrics, with three replicates each. Light-fastness exposure conditions were thosefound in AATCC Method 16-1998, Op-tion E. Each sample was evaluated instru-mentally three times and averages werecalculated. The data is found in Table I.
11.1.2 Within-laboratory standard er-rors and Sample Variance are shown inTable II. Data is on file at the AATCCTechnical Center.
11.2 Bias. The colorfastness to naturaland artificial light can be defined only interms of a test method. There is no inde-pendent method for determining the truevalue. As a means of estimating thisproperty, the method has no known bias.