GATE (TF) Textile 2012 Question Paper Solution | GATE/2012/TF/22

Question 22 (Textile Engineering & Fibre Science)

Malachite Green is an important dyestuff. The typical green colour is obtained when the dye molecule is

(D)Made up of phenyl groups
Answer / Solution
[Show Answer]

Option B

Frequently Asked Questions | FAQs

What is malachite green dye used in?

Malachite is a green-colored mineral that has been used as a source of pigment and dye for thousands of years. Malachite dye is derived from the mineral and is used in various applications in the textile industry, including:
Fabric dyeing: Malachite dye is used to dye natural fibers, such as cotton, silk, and wool, to create shades of green.
Printing: Malachite dye is used in screen printing and block printing to create green-colored designs on fabric.
Embroidery: Malachite dye is used to color embroidery threads to create green-colored embroidery designs.
Cosmetics: Malachite dye is sometimes used in cosmetics, such as eye shadows or nail polishes, to create a green color.
Jewelry: Malachite is sometimes used as a decorative stone in jewelry, and its green color can be enhanced or intensified by treatments or dyes.
Malachite dye is a natural, plant-based dye that has been used for centuries. It is known for its vibrant green color and can produce a range of shades depending on the concentration and method of application.

Is malachite green basic or acidic dye?

Malachite green is a basic dye, which means it has a positive charge and is attracted to negatively charged fibers. It is a cationic dye, meaning it contains a positively charged ion, which allows it to bond to negatively charged groups in the fiber, such as the carboxyl and sulfate groups. Basic dyes are commonly used to color synthetic fibers like acrylic, polyester, and nylon, as well as some natural fibers like silk and wool. Malachite green is known for its bright green color and has been used for dyeing textiles, paper, and leather for over a century.

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