ISO INTERNATIONAL STANDARD 4630 Third edition 2015-12-01 Clear liquids Estimation of colour by the Gardner colour scale Liquides clairs - Evaluation de la couleur au moyen de I'échelle de couleur Gardner Reference number ISO 4630:2015(E) ISO @IS02015 IS0 4630:2015(E) COPYRIGHT PROTECTED DOCUMENT @ IS0 2015, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +4122 749 09 47 [email protected] www.iso.org @ IS0 2015 - All rights reserved IS0 4630:2015(E) Contents Page Foreword .iv 1 Scope ..1 2 Normative references 3 Principle ..1 4 Apparatus and materials ..1 5 Sampling. ..2 6 Procedure ..2 7 Expression of results ..2 8 Precision .2 8.1 General .2 8.2 Repeatability limit, r .2 8.3 Reproducibility limit, R .3 8.4 Bias. .3 9 Test report ..3 Annex A (normative) Gardner colour standards 4 Bibliography 6 sn Sandardizann rights reserved iii