Description
Property and usage
It is a kind of bleu powder reducing dye, and is the initial product of indigo. It is produced by stoving the filter cake from the former section. It is insoluble in water, ethanol and ethyl ether, but soluble inmelt benzoyl oxide. Itis mainly used in the dyeing and printing of cotton fiber, and is the special dye for jean fabric. It can also be processed into food dye and biochemical agent.
Quality index
| Appearance | Homogenic dark blue powder |
|---|---|
| Color light | similar as the standard sample |
| Content,% | $\ge$ 94.0%, $\le$ 96.0% |
| Moisture content,% | $\le$ 1.0% |
| Strength,% | equal to 100 percent of standard sample |
| pH value | 7 |
| Content of ferric ions, ppm | $\le$ 200PPM |
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