Vat
Dye:
Vat dyes are an ancient class of dyes, based on the natural dye, indigo, which is now produced synthetically. Vat dyeing is a process that refers to dyeing that takes place in a bucket or vat. Most vat dyes, which require a reducing agent to solubilize them, are less suitable than fiber-reactive dyes for amateurs.
Vat dyes are an ancient class of dyes, based on the natural dye, indigo, which is now produced synthetically. Vat dyeing is a process that refers to dyeing that takes place in a bucket or vat. Most vat dyes, which require a reducing agent to solubilize them, are less suitable than fiber-reactive dyes for amateurs.
VAT
DYE
|
|
MECHANISM
|
Vat
Process:
{Converting
Water-Insoluble to a Water-Soluble}.
Red
ox Reaction.
Reducing
Agents provide Attraction for the Fibers.
|
STRUCTURE
|
|
SOLUBILITY
|
In-Soluble
in Water.
Adding
Reducing Agents to become Soluble.
|
CHARGEABILITY
|
Negatively
Charged.
Alkali is Used for Removing Charge.
|
SUBSTANTIVITY
|
Substantivity
is good for Cellulosic Fibers.
High
Fixation because of Reducing Agents.
pH
Range : 12 - 15
|
FASTNESS
PROPERTIES
|
Washing
: Weak
Lightening
:
Good
Crocking
: Poor
Chemicals
:
Average
Perspiration
: Good
|
APPLIANCES
|
They
are Applied to Cellulosic and Proteinic Fibers; i.e. Viscose Rayon, Wool.
|
COLOUR
RANGE
|
Large
Range of Colors.
Dark
Shades Ability.
Major
Colors: Indigo, Green
and Black.
|
ENVIRONMENT
BEHAVIOUR
|
Non-Environmental
Friendly.
Cancer
Causing Dye.
|
COST
|
U.S:
9.9 – 13.98 $/Kg
Average
|
