ISO 22195-7:2024

International
Standard
ISO 22195-7
First edition
Textiles — Determination of index
2024-08
ingredient from coloured textile —
Part 7:
Himalayan rhubarb
Textiles — Détermination d'indicateurs d'ingrédients de textiles
colorés —
Partie 7: Rhubarbe de l'Himalaya
Reference number
© ISO 2024
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Reagent . 2
6 Apparatus . 2
7 Procedure . 2
7.1 Standard preparation .2
7.2 Preparation of test specimen .2
7.3 Analysis .3
7.4 Determination and calculation .3
7.4.1 Determination of emodin .3
7.4.2 Calibration curve.3
7.4.3 Calculation of emodin .3
8 Test report . 3
Annex A (informative) Example of test result . 5

iii
Foreword
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This document was prepared by Technical Committee ISO/TC 38, Textiles.
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iv
Introduction
There is no doubt that dyeing plays the most important role in expressing the colour of clothes. Until the
invention of synthetic dyes capable of expressing diverse colours, materials obtained from nature to dye
fabric have been used. Typically, colourants were obtained from plants or various materials were extracted
from minerals or insects. When dyeing fabrics using materials derived from these natural substances, it
becomes necessary to identify which substances the colourant was derived from. In other words, there has
been a demand to confirm whether a fabric is dyed using a natural substance.
A test method is developed to identify which type of natural substances has been used.

v
International Standard ISO 22195-7:2024(en)
Textiles — Determination of index ingredient from coloured
textile —
Part 7:
Himalayan rhubarb
1 Scope
This document specifies a test method for the determination of the index ingredient of chemicals in coloured
textile with aqueous extracts from the flowers of Himalayan rhubarb.
2 Normative references
The following document is referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document
...