| CAS
NO. |
482-89-3 |
|
| EINECS
NO. |
207-586-9 |
| FORMULA |
C16H10N2O2 |
| MOL
WT. |
262.26 |
| H.S.
CODE |
3204.15.1000 |
| TOXICITY |
Mouse LD50 (Oral):
> 32gm/kg |
| SYNONYMS |
Indigo Blue; Indigotin; C.I. Vat Blue 1; C.I.
73000; C.I. Pigment Blue 66; |
|
[delta(2,2')-Biindoline]-3,3'-dione; delta(2,2')Bipseudoindoxyl;
2-(1,3-Dihydro-3-oxo-2H-indol- 2-ylidene)-1, 2-dihydro -3H-indol-3-one;
2,2'-Bi(2,3-dihydro-3-oxoindolylidene);
2;2,3,2',3'-Tetrahydro-3,3'-dioxo-2,2'- biindolylidene;
2,3,2',3'-Tetrahydro-3,3'-dioxo-2,2'- biindolylidene; Other RN: 11129-41-2;
12000-74-7; 12626-73-2; 93660-98-1; 136797-30-3; 210488-46-3; 908005-94-7; |
| SMILES |
C1(=C2\C(c3ccccc3N2)=O)\C(c2ccccc2N1)=O |
|
CLASSIFICATION
|
Coloring
Agent, Redox Indicators, Stains and Dyes
|
|
PHYSICAL AND CHEMICAL PROPERTIES
|
| PHYSICAL
STATE |
Dark
blue powder or granule |
| MELTING POINT |
390
- 392 C (Decomposes) |
| BOILING
POINT |
|
| SPECIFIC GRAVITY |
|
| SOLUBILITY
IN WATER |
Practically insoluble
(13.4 mg/l), Practically insoluble in dilute acids, alcohol and ether.
Soluble in conc. H2SO4, aniline,
nitrobenzene, chloroform and glacial acetic acid. |
| AUTOIGNITION |
|
| pH |
|
| VAPOR DENSITY |
|
| log Pow |
3.72
(Octanol-water) |
| VAPOR
PRESSURE |
9.00E-13 (mmHg at 25 C) |
|
HENRY'S LAW |
5.01E-14 (atm-m3/mole at 25 C) |
| OH RATE |
8.26E-11
(cm3/molecule-sec
at 25 C Atmospheric ) |
| NFPA RATINGS |
Health
Hazard: 2, Fire: 0, Reactivity Hazard: 0
|
|
REFRACTIVE
INDEX
|
|
| FLASH
POINT |
|
| STABILITY |
Stable under ordinary conditions |
|
GENERAL
DESCRIPTION & EXTERNAL LINKS
|
|
Indigo is a component of blue vat dye naturally obtained from plants like genus
Indigofera and Isatis tinctoria. It is now produced synthetically. The key
functional group in indigo is C6H4(NH)C(O=)C=, called indogen. It is insoluble in
water but soluble in hot aniline and hot chloroform. It become water soluble and
colorless form when reduced in the presence of an alkali, which makes easy
to dye. Subsequent oxidation process is required to get the target color. Dying
is the oxidation process of the fabric. After the fabric is dyed, the dye revert
to water insoluble form. There is a solubilized water-soluble vat dye which does
not need the presence of alkali, and thus can be applied to dye animal fibres like wool and silk. Vat
dyes are applied particularly to cotton and and rayon where high wash and boil
fastness required. Indigo is used in mainly for dyeing heavy blue to grayish
purple blue shades for work clothes. It is also used in printing inks and
paints. Examples of vat dyes are indigo, thioindigo, indanthrone. Wikipedia
Linking: http://en.wikipedia.org/wiki/Indigo,
http://en.wikipedia.org/wiki/Indigo_dye
http://www.madehow.com/
Indigo, or indigotin, is a dyestuff originally extracted from the varieties
of the indigo and woad plants. Indigo was known throughout the ancient world for
its ability to color fabrics a deep blue. Egyptian artifacts suggest that indigo
was employed as early as 1600 B.C. and it has been found in
Africa, India, Indonesia, and China. The dye imparts a brilliant blue hue to fabric. In the dying process, cotton and linen threads are usually
soaked and dried 15-20 times. By comparison, silk threads must be died over 40
times. After dying, the yarn may be sun dried to deepen the color. Indigo is
unique in its ability to impart surface color while only partially penetrating
fibers. When yarn died with indigo is untwisted, it can be seen that the inner
layers remain uncolored. The dye also fades to give a characteristic wom look
and for this reason it is commonly used to color denim. Originally extracted
from plants, today indigo is synthetically produced on an industrial
scale.....
http://faculty.bennington.edu/
Indigo
is a vat dye, meaning that the colorant itself (that is, pure indigo)
is not soluble in water and therefore cannot be used directly to
color fabric. This is because a dye must penetrate the fibers of
a material in order to produce an effective color; they cannot be
simply applied to the surface like a paint. So to use indigo to
dye fabrics, it must in a converted to a compound that readily dissolves
in water. In traditional dyeing procedures, the reaction to produce
the soluble form of the dye took place in open vats, hence the term,
vat dye....
|
| SALES
SPECIFICATION |
|
APPEARANCE
|
Dark
blue powder (or granule) |
|
CONTENT
|
94.0%
min
|
|
RESIDUE
ON IGNITION
|
1.0%
max
|
|
MOISTURE
|
0.8%
max
|
|
IRON
|
0.5%
max
|
|
PARTICLE
SIZE |
96.0%
min (60 mesh)
|
| TRANSPORTATION |
| PACKING |
|
| HAZARD CLASS |
3
(6.1) |
| UN
NO. |
3079
|
| OTHER
INFORMATION |
|
|