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Indigo Blue Dyestuff

Indigo Blue Dyestuff
1) Indigo blue (VAT blue 1)
2) CAS no.: 482-89-3
3) M. F.: C16H10O2N2
4) M. W.: 262.26
5) Content: 94% min.
6) Moisture: 1% max.
7) Fe 3+: 200ppm max
8) Appearance: blue powder or granular
9) Light fastness: 3 - 4
10) Wash fastness: 4
11) Usage: as dyestuff, mainly used to dye cotton fabrics, to make
5.5'-7.7'-tetraroma indigo, biochemical medicament and indicator

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