ISO INTERNATIONAL STANDARD 105-B05 Fourth edition 1993-10-15 Textiles Tests for colour fastness Part B05: Detection and assessment of photochromism Textiles -- Essais de solidité des teintures Partie Bo5: Détection et évaluation de la phototropie OSI Reference number ISO 105-B05:1993(E) ISO105-B05:1993(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through IsO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be and non-governmental, in liaison with isO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) 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 a vote. iSO/TC 38, Textiles, Sub-Committee SC 1, Tests for coloured textiles and colorants. This fourth edition cancels andreplacesthe ethird edition (ISO 105-B05:1988), of which it constitutes a minor revision. ISO 105 was previously published in thirteen "parts", each designated 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 are now being republished as separate documents, them- nations. A complete list of these parts is given in ISO 105-A01. ISO1993 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means,electronic or mechanical, including photocopying and microfilm,without per- mission in writing from the publisher. InternationalOrganizationforStandardization Case Postale 56· CH-1211Geneve 20·Switzerland Printed in Switzerland ii ISO 105-B05:1993(E) INTERNATIONAL STANDARD Textiles Tests for colour fastness Part B05: Detection and assessment of photochromism Scope IsO 105-B01:1989, Textiles - Tests for colour fast- 1 ness ---- Part Bo1: Colour fastness to light: Daylight. This part of ISO 105 specifies a method intended for detecting and assessing change in colour, after brief ISO105-B02:1988,Textiles-Testsforcolourfast exposure to light, of coloured textiles which change ness Part Bo2: Colour fastness to artificial light: in colour on exposure to light but which virtualy return Xenonarcfading lamptest. to their original shade when stored in the dark. 3Principle NOTE 1 This phenomenon usedto be termed "phototropism",but theterm"phototropism" is much A specimen of the textile is exposed to light of high more widely used in biological science where its meaning is entirely different. As the derivation of "phototropism" is intensity for a time much shorter than that necessary in accordwithitsbiological meaning the term to cause a permanent change. The change in colour photochromism preferableforreversiblecolour of the specimen is assessed immediately after ex- changes induced by light. posure, using the grey scale. The specimen is then stored in the dark and assessed again. 2 Normative references Reference materials and apparatus The followingstandardscontainprovisionswhich 4.1 Reference materials through reference in this text, constitute provisions of this part of isO 105. At the time of publication, the The references used for this test are References 1 editions indicated were valid. All standards are subject and L2 as specified in subclauses 4.1.1 and 4.1.2 of to revision, and parties to agreements based on this ISO 105-B01:1989. part of Iso 105 are encouraged to investigate the possibility of applying the most recent editions of the standardsindicatedbelow.MembersofIECandISO 4.2 Apparatus maintain registers of currently valid International Standards. 4.2.1 Light source, a xenon arc lamp of correlated colour temperature 5 500 K to 6 500 K ISO 105-A01:1989, Te