ISO INTERNATIONAL STANDARD 3298 Second edition 1994-05-01 Photography -- Processing chemicals Specifications for glacial acetic acid Photographie - Produits chimiques pour traitement - Spécifications relatives a I'acide acétique cristallisable so Reference number ISO 3298:1994(E) No reproduction or networking permitted without license from IHS Not for Resale ISO 3298:1994(E) Foreword SO (the International Organization for s Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work 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. sare circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 3298 was prepared by Technical Committee ISO/TC 42, Photography. This , second edition cancels and replaces the first edition (ISO 3298:1976), which has been technically revised. ISO 1994 All rights reserved. Unless otherwise specified, 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 permission in writing from the publisher International OrganizationforStandardization Case Postale 56· CH-1211 Geneve 20· Switzerland Printed in Switzerland national Organization for Standardization No reproduction or networking permitted without license from IHS Not for Resale CISO ISO 3298:1994(E) Introduction 0.1 This International Standard is one of a series that establishes criteria ofpurityforchemicalsusedinprocessingphotographicmaterials.General compiled in parts 1 and 5 of ISO 10349. This International Standard is intended for use by individuals with a work- ing knowledge of analytical techniques, which may not always be the chemicals. Safe laboratory practice for the handling of chemicals requires apparel such as face masks or aprons where appropriate. Normal pre- exercised at all times but care has been taken to provide warnings for hazardous materials. Hazard warnings designated by a letter enclosed in angle brackets, <>, are used as a reminder in those steps detailing hand- ling operations and are defined in ISO 10349-1. More detailed information fromthemanufacturer. 0.2 This International Standard provides chemical and physical require- ments for the suitability of a photographic-grade chemical. The tests cor- relate with undesirable photographic effects. Purity requirements are set as low as possible consistent with these photographic effects. These cri- teria are considered the minimum requirements necessary to assure suf- ficient purity for use in photographic processing solutions, except that if the purity of a commonly available grade of chemical exceeds photo- graphic processing requirements and if there is no economic penalty in its use, the purity requirements have been set to take advantage of the keep the number of requirements to a minimum. Inert impurities are lim- ited to amounts which will not unduly reduce the assay. All tests are per- furnished for use. Although the ultimate criterion for suitability of such a shorter, more economical test methods described in this International Standard are generally adequate. method is available. An effective assay requirement serves not only as a safeguard of chemical purity but also as a valuable complement to the identity test. ldentity tests have been included whenever a possibility ex- tests. Copyright International Organization for Standardization ili nitted without license from IHS Not fr Resale