- Indigo is among the
oldest dyes to be used for textile dyeing and printing. Many Asian
countries, such as India, China, and Japan, have used indigo as a dye
for centuries. The dye was also known to ancient civilizations in Egypt,
Greece, Rome, Britain, Peru, and Africa.
- Indigo is a
subtropical shrub 1 to 2 meters tall that possesses the woad pigment in
the leaves. Leaves are crushed and then soaked in water for fermentation
(removal of the sugar).
- The natural dye
comes from several species of plant, but nearly all Indigo produced
today is synthetic. Among other uses, it is used in the production of
denim cloth for blue jeans.
- Indigo is a dark
blue crystalline powder that melts at 390°–392°C. It is insoluble in
water, alcohol, or ether but soluble in chloroform, nitrobenzene, or
concentrated sulfuric acid.
- The raw materials
used in the natural production of indigo are leaves from a variety of
plant species including indigo, woad, and polygonum. Only the leaves are
used since they contain the greatest concentration of dye
molecules.
- In Bangladesh indigo
was widely cultivated during the early nineteenth century when British
planters made large investments in it. The districts where it was widely
cultivated were Nadia, Jessore, Bogra, Rangpur and Dhaka.
- The roots, stems and
leaves are biter, thermogenic, laxative, trichogenous, expectorant,
anthelminitic, tonic and diuretic, and are useful for promoting the
growth of hair and in gastropathy, splenomegaly, cephalagia,
cardiopathy, chronic bronchitis, asthma, ulcers and skin
diseases.
- The juice expressed
from the leaves is useful in the treatment of hydrophobia. An extract of
the plant is good for epilepsy and neuropathy. The plant possesses
anti-toxic property.
- Much of the need for
indigo is being met with other types of blue dyes and today most of the
indigo used by the world is made out-side the United States.
- While at present
natural indigo accounts for less than 1% of the total indigo market, a
European Union survey suggests that by 2005 15% of textile sales will
have been dyed using natural products.
- World consumption of
indigo in the 1800s was very large indeed, so in 1866 a German chemist
named Adolph von Baeyer began his studies of the pigment and eventually
elucidated its chemical structure so that it could be synthesized
commercially.
At the end of the 19th century, Germany was able to
produce synthetic indigotine cheaper than the natural dyestuff, and thus
Germany then took charge of supplying indigo. |
General
Introduction
- Indigo in the Early
Modern World
- Indigo
- Indigo
Dye
- Indigo dye -
Chemical Syntheses
- Dyeing with Indigo
- History of the
dyestuff
- MSDS
Technology
- Technology
Offer
- Indigo
Dyeing
- Developments in
dyeing technology
- Dyeing Polyester
Fabrics with Indigo
- Fabric
Technology
- Membrane Technology
in Textile Operations
- Muslims And Muslim Technology In
The New World
- How to Paint Dye
With Our "Magic" Indigo Natural Dye Fabric Paint
- Indigo nation: Champaran to Chandigarh
- Warp Yarn - Indigo
Dye Range
Plants Used
and Their Cultivation
- The Potential Use of
Organically Grown Dye Plants in the Organic Textile Industry
- Indigo Cultivation
in British East Florida
- Western
Indigo
- Isatis
tinctoria
- Indigofera tinctora
- Habitat
- Indigofera jucunda
- Indigofera
tinctoria
- Fibers, Dyes and
Tannins
- Mercurialis
leiocarpa
- Desert False
Indigo
- Indigo - grow
it
- Randia aculeata
L.
- Polygonum
tinctorum
- Wild
Indigo
- Wild Indigo
[Baptisia tinctoria (L.) R. Br.]
Indigo
Extraction and Manufacturing Process
- Extraction
Process
- The preparation of
natural indigo
- Extraction from
Indigo Plant
- How Indigo is
Made
- Improving Quality
and Reproducibility of the Indigo Dye Process
- Indigo - production
& trade
- Dye Production in
India
- Pigment Extraction
Techniques
- Cultivation and
Extraction of Natural Dyes for Industrial Use in Natural Textiles
Production
- SPINDIGO –the
production chain
Market
- Indigo Planters
- German Industry and
Global Enterprise
- Natural Dyeing in
India : Past and Future
- Indigo and Tyrian
Purple—In Nature and in the Lab
- Indigo
Market
|
Projects
- New Projects Boost
LINK Programme
- Sustainable
production of plant-derived indigo
- Dyes and Dye
Intermediates
- SPINDIGO
-
Patents
- Indigo Dye
Process
- Process for Dyeing
Cellulosic Textiles with Indigo
- Method for dyeing
cotton with indigo
- Microbial Production
of Indigo
- Reduced Indigo Dye
Penetration
- Solvent Process for
Recovering Indigo Dye From Textile Scrap
Consultants
- N S Chemicals & Consultants Pvt. Ltd
- Experts in
'indigo dye'
- Global DyeHouse
Consultants
Reports
- The Journal of
Industrial and Engineering Chemistry
- The Impact of EU
Research
- Indigo
Carmine-Induced Bradycardia in a Patient During General
Anesthesia
- Synthetic Indigo
From China
- ISIS Experimental
Report
- Unravelling the
Threads of History
- Textiles From Around
the Globe
Applications
- Cosmetic
Uses
- Mysterious
Dye
- Japanese Indigo
Pigment Sticks
- Indigo - western
medicine
- Dyeing with
Synthetic Indigo Powder In a Reduction Vat
- Medical Uses, and
Dosage
- The Instant
Indigo Dye Kit
- Indigo
Kit
Company
Profiles
- Hebei Wuqiang
Chemical Plant
- Indigo Products
Ltd
- Kirpal Export
Overseas
- KMA Exports
- KSG Enterprises
Suppliers
- Indigo Dye
Sellers
- Indigo Blue Dye Suppliers
- Indigo Dye
Manufacturers and Suppliers
- Indigo
Blue Manufacturers and Suppliers
- Indigo Carmine
Suppliers
- Companies
- Indigo Powder
Suppliers
- Indigo Dye
Manufacturers
- Indigo
Suppliers
- Equipment
Suppliers
Buyers
- Indigo Importers
List1
- Indigo Importers
List2
- Indigo Blue Dye
Buyers List
- Indian Importer & Buyer
- Importer and
Supplier
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