Reaffirmed 2024

1. SCOPE

This standard prescribes test method and identification requirement of dried/ aqueous extract of natural indigo dye and indigo dyed textiles. The detection and identification of synthetic indigo and natural colorant indigo are conducted using kit method given in Annex A. Confirmatory tests can be carried out through Thin Layer Chromatography (TLC), High Performance Thin Layer Chromatography (HPTLC) and High Performance Liquid Chromatography (HPLC) by chromatographic techniques as given in Annex B, C and D as well as by UV-Visible, Fourier Transform Infrared Spectroscopy (FTIR) and Nuclear Magnetic Resonance (NMR) spectroscopic techniques as given in Annex E, F and G. The method for extraction of natural indigo dye from dyed swatches is given in Annex H.

2. REFERENCES

The following standard contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the edition indicated were valid. All standard is subject to revision and parties to agreements based on this standard is encouraged to investigate the possibility of applying the most recent edition of the standard indicated below.

11636 : 1986 Method of determination of strength of indigo in substance