GB/T 42701-2023 in English

《GB/T 42701-2023纺织品 天然彩色棉的鉴别 化学显色法》由TC209（全国纺织品标准化技术委员会）归口，TC209SC1（全国纺织品标准化技术委员会基础标准分会）执行，主管部门为中国纺织工业联合会。

Textiles - Identification of naturally colored cottons - Chemical staining method

WARNING——Persons using this document shall be familiar with normal laboratory practice. This document does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions.

1 Scope

This document describes the method for identification of naturally colored cottons (including natural brown cottons and natural green cottons) by chemical staining method.

This document is applicable to naturally colored cottons and their mono-fiber products, and blended or interwoven products of naturally colored cottons and uncolored fibers.

2 Normative references

The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

GB/T 6682 Water for analytical laboratory use - Specification and test methods

3 Terms and definitions

No terms and definitions are listed in this document.

4 Principle

The specimen is moistened by drops of color reagents under specified conditions, the specific polyphenol pigments contained in the naturally colored cottons in the specimen will react chemically with the color reagents and change the color of the specimen, the presence of naturally colored cottons is then judged by observing the color change of the specimen.

Contents
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and equipment
6 Sampling
7 Pretreatment of specimen
8 Test steps
9 Result judgment
10 Test report
Annex A (Informative) Judgment method of starchy slurry and destarching method
Annex B (Information) Typical colors of naturally colored cottons and their products before and after staining test
Bibliography