Reaffirmed 2023

NATIONAL FOREWORD

This Indian Standard (Part 2) which is identical with ISO 11642 : 2012 ‘Leather - Tests for colour fastness - Colour fastness to water' issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Leather, Tanning Material and Allied Products Sectional Committee and approval of the Chemical Division Council.

The Indian Standard IS 6191 : 1971 Methods of micro - biological, colour fastness and microscopical tests for leather prescribes various microbiological test methods, colour fastness test methods and test methods for the preparation of microscopical slides for assessment of leather, hides and skins. The Committee responsible for formulating this standard has decided to harmonize the methods of test prescribed in IS 6191 with those prescribed in ISO/IULTCS standards. Accordingly, the committee decided to retain IS 6191 and publish the harmonized/ adopted test methods published by ISO/IULTCS in various parts of IS 6191 as this standard is widely recognized by the Indian Leather Industry.

The committee further decided to publish the adopted/harmonized standards in the following manner:

a) Wherever an existing test method is being replaced by the corresponding ISO/IULTCS test method, the relevant part will be published as revision with the information in the national foreword about the method of IS 6191 being superseded.

b) When a new test method is being incorporated in IS 6191, the same will be published as a new standard and as subsequent part of IS 6191.

The text of 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’.

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.