IS 11751 : 2024/ISO 418 : 2001 Sodium Sulphite, Anhydrous, Photographic Grade - Specification
NATIONAL FOREWORD
This Indian Standard (First Revision) which is identical to ISO 418 : 2001 'Photography - Processing chemicals - Specifications for anhydrous sodium sulfite' 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.
The specification for sodium sulphite anhydrous, photographic grade was earlier covered under IS 247 : 1972 along with other grades of the material. The Committee responsible for formulation of this standard felt that a separate standard for the photographic grade of the material should be formulated. Consequently, this standard covering only the photographic grade of the material was formulated in 1986.
Now this standard is being revised by adopting ISO 418 : 2001 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, it 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.