Textile Dyeing and Colour Fastness Quiz

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Questions and Answers

What is the function of mordants in the dyeing process?

To increase the cost of dyeing

To remove the color from the fiber

To reduce the environmental concerns

To bind the dye to the fiber (correct)

What is the main difference between dyes and pigments in textile dyeing?

Dyes are incorporated into the fiber, while pigments stick to the fabric (correct)

Dyes are mixed with resin, while pigments undergo a curing process

Dyes have environmental concerns, while pigments do not

Dyes have higher color fastness than pigments

What is the primary source of natural dyes used in textile dyeing?

Flowers and berries (correct)

Chemical agents

Resin binder

Perspiration and air pollution

Which factor affects the color fastness of textiles under different conditions?

Perspiration Signup and view all the answers

What is the purpose of treating textile material in an aqueous solution during dyeing?

To mix fiber, yarn or fabric with water, dye & chemicals for an affixed time duration Signup and view all the answers

What is the purpose of a carrier in textile dyeing?

To promote the dyeing of hydrophobic fibers Signup and view all the answers

Which type of dyes is mostly used for wool and silk?

Acid Dyes Signup and view all the answers

What is the function of auxiliaries in the dyeing process?

To facilitate and modify the dyeing process Signup and view all the answers

What does the M:L ratio of 1:20 mean in textile dyeing?

20 liters of dye liquor is required for 1 kg of material Signup and view all the answers

What is the main difference between pigment dyes and other types of dyes?

Pigment dyes do not require a mordant for fixation Signup and view all the answers

What is the purpose of a mordant in textile dyeing?

To increase the fastness of the dye to the fiber Signup and view all the answers

What is the main difference between disperse dyes and basic dyes in textile dyeing?

The type of fiber they are used for Signup and view all the answers

What is the function of pigment dyes in textile dyeing?

To hold color to the fabric using resins and high temperature Signup and view all the answers

What is the primary factor in selecting dyes for textile dyeing?

Coloration Signup and view all the answers

What is the main difference between textile dyeing and printing?

The styles of application: one uses a solution (aqueous) known as the dye liquor or dye bath, and the other uses direct application in a paste form Signup and view all the answers

Study Notes

Textile Dyeing

The process of dyeing involves the use of dyestuffs and the treatment of textile material in an aqueous solution.
Fibre, yarn, or fabric is mixed with water, dye, and chemicals for a fixed time duration.

Colour Fastness

Colour fastness refers to the ability of a colour to retain its original shade under different conditions.
Factors affecting colour fastness include perspiration, dry cleaning, air pollution, rubbing, and water.

Mordants

A mordant is a chemical agent that binds the dye to a fibre, which otherwise has little or no affinity for the dye.
Mordants are essential for dyeing textile materials.

Natural Dyes

Primitive people obtained dyes from natural sources such as flowers, nuts, berries, and roots.
Examples of natural dyes include indigo, alizarin, saffron, madder, logwood, and catechu.

Factors Affecting Dye Selection

Textile affinity: the ability of a dye to bind to a specific fibre.
Colour fastness: the ability of a colour to retain its original shade under different conditions.
Cost: the financial expense of using a particular dye.
Ease of application: the complexity of the dyeing process.
Environmental concerns: the impact of the dye on the environment.

Pigments

Pigments are microscopic, insoluble, coloured particles that are made to stick to the fabric.
Pigments are usually mixed with a resin binder and applied to fabrics as a solid colour or print.
The resin must be heated in a process called curing to adhere the pigment to the fabric.

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Description

Test your knowledge of textile dyeing, colour fastness, and mordants with this quiz. Explore the process of dyeing, factors affecting colour fastness, and the role of mordants in binding dyes to textiles.