IS 557 : 2024/ISO 3943 : 1993 Sodium Acetate, Photographic Grade - Specification
NATIONAL FOREWORD
This Indian Standard (Fourth Revision) which is identical to ISO 3943 : 1993 'Photography - Processing chemicals - Specifications for anhydrous sodium acetate' issued by the International Organization for Standardization (ISO), was adopted by the Bureau of Indian Standards on the recommendation of the Electroplating Chemicals and Photographic Materials Sectional Committee and approval of the Chemical Division Council.
This Indian Standard is one of a series of specifications for photographic grade chemicals which are commonly used in the processing of sensitized photographic materials. These specifications have been prepared to establish criteria of purity which will provide a practical and economical grade, and prevent possible faulty processing which might be caused by chemicals of inferior quality, and to furnish manufacturers, suppliers and processors with reliable and readily available specifications for photographic chemicals of satisfactory quality.
This standard was first published in 1954 and subsequently revised in 1968, 1978 and 1988. This standard contained technical as well as photographic grade of the material. In the last revision, requirements for only photographic grade of the material were retained in this standard. The limit for anhydrous sodium acetate content had also been modified.
Now, the standard is being revised by adopting ISO 3943 : 1993 on dual number basis.
The text of the ISO standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:
a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 'Indian Standard'; and
b) Comma (,) has been used as a decimal marker, while in Indian Standards the current practice is to use a point (.) as the decimal marker.