ISO INTERNATIONAL STANDARD 105-A06 First edition 1995-12-01 Textiles -- Tests for colour fastness Part A06: Instrumental determination of 1/1 standard depth of colour Textiles-Essaisdesoliditédesteintures PartieAo6:Méthode instrumentale pourla determination de la profondeur denuance standard 1/1 [so Reference number ISO105-A06:1995(E) ISO105-A06:1995(E) Foreword IsO (the International Organization for Standardization) is a worldwide of preparing International Standards is normally carried out through iso technical committees. Each member body interested in a subject for represented on that committee. International organizations, governmental and non-governmental, in liaison with Iso, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (lEC)on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the memberbodies casting a vote. International StandardISO105-A06waspreparedbyTechnicalCommittee ISO/TC 38,Textiles,Subcommittee SC 1,Tests for coloured textiles and colorants. IsO 105was previously published in thirteen"parts",eachdesignated by Each part contained a series of "sections", each designated by the re- spective part letter and by a two-digit serial number (e.g."Section Ao1"). These sections arenowbeing republished as separatedocuments,them nations. A complete list of these parts is given in ISO 105-A01. Annexes A and B of this part of ISO 105 are for information only. ISO 1995 All rights reserved. Unless otherwise specified, no part of this pubication may be reproduced microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56·CH-1211Geneve 20·Switzerland Printed in Switzerland ii ISO105-A06:1995(E) INTERNATIONALSTANDARDISO Textiles Tests for colour fastness Part A06: Instrumental determination of 1/1 standard depth of colour Scope 3Principle 1 This method is intended for determining 1/1 standard The CIELAB colour coordinates L*(lightness),Cat depth of a dyeing on any textile material by a color- (chroma) and hab (hue) of the dyeing to be checked for imetricmethodas apermitted alternativetothevisual 1/1standarddeptharemeasuredinstrumentally.The method described in clause 12of IS0105-A01:1994. lightness Lsp for 1/1 standard depth is calculated by means of a given equation.The lightness difference This method is applicable to 1/1 standard depth of AL between the measured lightness L' of the dyeing colour only. Its use for other standard depths is under and the calculated lightness Lsp required for 1/1 consideration. standard depth is determined to decide if the dyeing represents 1/1 standard depth. NOTE1 Specimens which this colorimetric method indi- catetobe of1/1standard depthmaydifferfromspecimens whicharevisuallyassessedtobe of 1/1standarddepthby 4. Apparatus comparisonwithphysicalstandardsknowntobeof1/1 standard depth. These differences may lead to differences 4.1 Spectrophotometer or colorimeter,meeting in the results of tests applied subsequently. It is rec- any one of the definitions described in CiE publication ommended that the method of assessment of 1/1 standard 15.2,subclause1.4. depth, i.e.iSO 105-A06 or visual, be included in the report oftestssubsequentlyapplied 5 Test specimen 2Normativereference Cut a representative specimen of the dyeing to be checked for 1/1 standard depth and mount it on an The following standard contains provisions which, opaque white backing which has not beenpretreated through reference in this text, constitute provisions with a fluorescent whitening agent. The size of the ofthispartofiSO105.Atthetimeofpublication,the specimen shall fit at least the aperture of the instru- edition indicated was valid. All standards are subject ment to be used for measurement.A minimal speci- to revisi