Colour Fastness

Topics: Textile, Clothing, Dry cleaning Pages: 11 (1140 words) Published: November 28, 2013
Colour Fastness

Presented
By
T. SRIVANI

Textile testing

Textile testing include:






Development of new fabrics
Maintenance of desired quality level
Analyzing the cause of the problem in fabric
Determination of acceptable consumer
performance level

Different kinds














Tensile testing
Crease recovery
Abrasion testing
Color fastness
Burning test
Fiber identification
Twist measurement
Stiffness testing
Textural rigidity
Crease resistance
Pilling test
Calculation of G.S.M

COLOUR FASTNESS
The property of a pigment or
dye, or the leather, cloth, paper,
ink, etc., containing the coloring
matter, to retain its original hue,
especially without fading,
running, or changing when
wetted, washed, cleaned; or
stored under normal conditions
when exposed to light, heat, or
other influences.

Colour Fastness


Property of fabric to keep its color intact on applying
external force or reagent. Textile materials change color
due to influence of various conditions.



Environmental factors such as sunlight, wear factors such
as abrasion cause colors to be altered. Perspiration as well as laundering and dry cleaning cause color changes in
fabric.

IMPORTANCE OF TESTING
COLOR FASTNESS
 The color of a textile is the most important attribute in terms of marketing

 Adds to the garment quality
 Determines the durability of fabric
 Mandatory for fabrics to be colorfast as per usage.

NEED FOR TESTING
•To estimate the quality parameters
•To standardize
•To meet company standards
•To adhere to customer requirements

Gray Scales


It is a scale graded up to ‘5’ used for evaluating change in color and staining.



The specimens are manually evaluated on a 5-4-3-2-1
scale where class 5 means no shade change and class 1
means a very great shade change. An average of rating is
taken as a result.



Intermediate ratings like class like 3.5 or class 3-4 are also used

Problems faced with the fabric


Colour loss- on washing, dry cleaning, perspiration.



Staining- Garments are often in contact with each other while being worn or cleaned. The migration of color from one
garment to another can result in the staining. The staining
effect can be determined at the same time as the color
fastness test is performed by attaching a special white fabric strip to the test specimen at beginning of the test and
evaluating the strip after the color fastness test has been
completed.

Methods for determining colour fastness


Rubbing



Observation after dry cleaning



On passing light (xenon arc light)



Observation after perspiration



Observation of a fabric on washing



Frosting

CLASSIFICATION OF COLOR
FASTNESS
 Light fastness
 Washing fastness
 Rubbing fastness
 Perspiration fastness
 Drycleaning fastness

Rubbing/Crocking






The color transference by rubbing from one colored textile
material to other. The scope of the crocking test does not
include how well a textile material withstands a rubbing action before physical signs of how a color change begin to appear. These are examined in a abrasion test or a color fastness to frosting test.

Materials- Rubbing cotton cloth (4 inch *4 inch), colored fabric which is to be rubbed 4cm*8cm
Machines- Scissors, corckmeter

Crockmaster COLOUR FASTNESS TO
RUBBING TESTER 670

Machines used for rubbing
Motorized
Smooth,
precisionengineered mechanism with•pre-settable digital counter guaranteed accuracy of loading and
stroke length.
Crockmaster COLOUR FASTNESS TO
RUBBING TESTER 680

Observation after dry-cleaning


This test gives an indication as to what will happen to the
color of the textile material after repeated commercial dry
cleanings.



Perchloroethylene is used in the test for several reasons:
 It is one of the two most widely used dry cleaning solvents, the...
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