GATE (TF) Textile 2018 Question Paper Solution | GATE/2018/TF/37

Question 37 (Textile Technology & Fibre Science)

A dye is applied on a fibre using Na2S2O4 as an auxiliary. Washing fastness of the dye on fibre is good. The correct combination of the dye and the fibre is

(A)Cationic dye, acrylic fibre
(B)Vat dye, cotton fibre
(C)Acid dye, wool fibre
(D)Reactive dye, cotton fibre
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Frequently Asked Questions | FAQs

What is colour fastness to washing in textile?

Color fastness to washing is a measure of a textile material’s ability to resist color fading or bleeding during washing. Textile materials may lose color or bleed during washing due to several factors such as the nature of the dye, the washing method, and the quality of the material.

Color fastness to washing is an important factor to consider when evaluating the quality of textile materials, especially those that will be subjected to frequent washing such as clothing and linens. The degree of color fastness is usually determined by subjecting the textile material to a standardized washing process and then evaluating its color change against a control sample.

Various standard methods are used to determine color fastness to washing, such as the ISO (International Organization for Standardization) method or the AATCC (American Association of Textile Chemists and Colorists) method. The test methods involve subjecting the textile material to a specified washing cycle using a detergent and a washing machine, and then evaluating the color change using a rating scale.

A high color fastness to washing rating indicates that the material is less likely to experience color fading or bleeding during washing, while a low rating indicates a higher likelihood of color change.

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