Colour Fastness

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