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هنر::
رنگ نیلی
Apart from indi- gofera species, there are several plants that can be used to produce indigo dye.
For example, the CI number of natural indigo dye is 75780 with the name CI Natural Blue 1 in which CI denotes Color Index, Natural indicates type of dye, Blue indicates the hue, and 1 is the identi- fying number.
5.12 Indigo Dyeing Process
The indigo dyeing process is different from the general natural dyeing process using mordants or direct dyeing as it is a vat dye.
That is the reason why indigo dyeing cannot be combined with any other natural dyeing process.
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