What is the main constituent of cotton fibers?
- Water
- Cellulose
- Polyester
- Silk
Correct Answer: Cellulose
Correct Answer Explanation: Cotton fibers are primarily composed of cellulose, a complex carbohydrate made up of carbon, hydrogen, and oxygen.
Why is raw cotton difficult to wet with water?
- It is naturally hydrophobic due to the presence of wax.
- It has a high density.
- It has a strong, rigid structure.
- It is naturally acidic.
Correct Answer: It is naturally hydrophobic due to the presence of wax.
Correct Answer Explanation: Raw cotton contains a natural waxy coating that repels water, making it difficult to wet.
What process increases cotton fibers’ strength and dye affinity?
- Bleaching
- Mercerisation
- Scouring
- Dyeing
Correct Answer: Mercerisation
Correct Answer Explanation: Mercerisation involves treating cotton fibers with a strong caustic soda solution, which causes them to swell and become more compact, resulting in increased strength and dye affinity.
What happens to cellulose when boiled in dilute acids?
- It becomes stronger.
- It dissolves completely.
- It transforms into hydrocellulose.
- It changes color.
Correct Answer: It transforms into hydrocellulose.
Correct Answer Explanation: Boiling cotton fibers in dilute acids converts cellulose into hydrocellulose, which is a brittle and powdery form of cellulose.
What is the name of the chemical process where an amine is converted into a diazo compound?
- Mordanting
- Diazotisation
- Topping
- Developing
Correct Answer: Diazotisation
Correct Answer Explanation: Diazotisation is a key process in the production of azo dyes. It involves converting an amine into a highly reactive diazo compound, which can then be coupled with a phenol or amine to form an insoluble dye on the fiber.
What is the purpose of mordants in cotton dyeing?
- To bleach the fibers.
- To soften the fibers.
- To make the colors more vibrant.
- To help dyes bind to the fibers.
Correct Answer: To help dyes bind to the fibers.
Correct Answer Explanation: Mordants are chemical substances that help dyes bind to fibers, creating insoluble color lakes. They act as a bridge between the dye molecule and the fiber, enhancing the fastness and durability of the color.
What is the name of the process where a dye is added to already dyed fabric to brighten or modify the shade?
- Mordanting
- Diazotisation
- Topping
- Developing
Correct Answer: Topping
Correct Answer Explanation: Topping is a dyeing technique where a dye is added to already dyed fabric to modify the shade, typically to brighten or deepen the color.
What type of dye requires cotton to be mordanted with tannic acid before dyeing?
- Direct dyes
- Basic dyes
- Acid dyes
- Sulfur dyes
Correct Answer: Basic dyes
Correct Answer Explanation: Basic dyes, also known as cationic dyes, have a positive charge and require a negatively charged mordant, such as tannic acid, to bind to the fibers.
What is the name of the process used to create a waterproof surface on cotton fabrics?
- Mercerisation
- Diazotisation
- Topping
- Willesden process
Correct Answer: Willesden process
Correct Answer Explanation: The Willesden process involves impregnating cotton fabrics with cupra-ammonium solutions, creating a waterproof surface. It was a popular method for making waterproof clothing and other textiles.
What is the name of the bright red color with a bluish tone produced by a complex process involving oiling, sumacing, mordanting with alumina, dyeing with alizarine, and clearing?
- Turkey red
- Alizarine violet
- Aniline black
- Indigo
Correct Answer: Turkey red
Correct Answer Explanation: Turkey red is a highly esteemed red dye that was historically produced through a laborious and time-consuming process. It involves a series of steps, including oiling, sumacing, mordanting with alumina, dyeing with alizarine, and clearing.
What is the name of the black dye produced by oxidizing aniline on the cotton fiber?
- Turkey red
- Alizarine violet
- Aniline black
- Indigo
Correct Answer: Aniline black
Correct Answer Explanation: Aniline black is a deep black dye produced by oxidizing aniline on the cotton fiber using various methods. It is a widely used dye in textiles, leather, and other industries.
What is the approximate percentage of hygroscopic moisture naturally present in raw cotton?
- 2%
- 8%
- 15%
- 25%
Correct Answer: 8%
Correct Answer Explanation: Raw cotton naturally contains around 8% hygroscopic moisture, which is the moisture absorbed from the air.
How much more coloring matter can mercerized cotton absorb compared to unmercerized cotton?
- Twice
- Three times
- Five times
- Ten times
Correct Answer: Three times
Correct Answer Explanation: Mercerized cotton, due to its increased surface area and dye affinity, can absorb up to three times more coloring matter compared to unmercerized cotton.
What is the approximate time it takes for a 10% solution of sulfuric acid at 80°C to convert cotton into hydrocellulose?
- 15 minutes
- 30 minutes
- 1 hour
- 2 hours
Correct Answer: 1 hour
Correct Answer Explanation: A 10% solution of sulfuric acid at 80°C takes about one hour to convert cotton into hydrocellulose, a brittle and powdery form of cellulose.
What is the typical concentration of bleaching powder solution used in the chemicing process?
- 0.5-1° Tw
- 2-3° Tw
- 5-7° Tw
- 10-15° Tw
Correct Answer: 0.5-1° Tw
Correct Answer Explanation: The chemicing process, a step in bleaching cotton, typically uses a bleaching powder solution with a strength of 0.5-1° Tw.
What is the typical strength of hydrochloric or sulfuric acid used in the white sour process?
- 0.5-1° Tw
- 2° Tw
- 5-7° Tw
- 10-15° Tw
Correct Answer: 2° Tw
Correct Answer Explanation: The white sour process, another step in bleaching cotton, typically uses hydrochloric or sulfuric acid at a strength of 2° Tw.
What is the typical amount of lime used in the Turkey red bleach process per 100 lb of goods?
- 1-2 lb
- 2.5-3 lb
- 5-7 lb
- 10-15 lb
Correct Answer: 2.5-3 lb
Correct Answer Explanation: The Turkey red bleach process, a traditional method for bleaching cotton for dyeing with alizarine, typically uses 2.5-3 lb of lime per 100 lb of goods.
What is the typical amount of caustic soda and soda ash used in warp bleaching per 1,000 lb of yarn?
- 10 lb caustic soda, 20 lb soda ash
- 20 lb caustic soda, 30 lb soda ash
- 30 lb caustic soda, 50 lb soda ash
- 50 lb caustic soda, 70 lb soda ash
Correct Answer: 30 lb caustic soda, 50 lb soda ash
Correct Answer Explanation: Warp bleaching, a method for bleaching cotton yarn, typically uses 30 lb of caustic soda and 50 lb of soda ash per 1,000 lb of yarn.
What is the typical amount of caustic soda, soda ash, and soda ash used in a hank bleaching process per 1,000 lb of yarn?
- 20 lb caustic soda, 30 lb soda ash, 20 lb soda ash
- 30 lb caustic soda, 40 lb soda ash, 30 lb soda ash
- 40 lb caustic soda, 50 lb soda ash, 40 lb soda ash
- 50 lb caustic soda, 60 lb soda ash, 50 lb soda ash
Correct Answer: 40 lb caustic soda, 50 lb soda ash, 40 lb soda ash
Correct Answer Explanation: A typical hank bleaching process, another method for bleaching cotton yarn, uses 40 lb of caustic soda, 50 lb of soda ash, and 40 lb of soda ash per 1,000 lb of yarn.
What is the typical percentage of dye-stuff required to produce full shades with sulfur dyes?
- 5-15%
- 10-20%
- 20-60%
- 50-80%
Correct Answer: 20-60%
Correct Answer Explanation: Sulfur dyes, a group of dyes containing sulfur in their composition, typically require a higher percentage of dye-stuff, ranging from 20-60%, to produce full shades.
What is the typical percentage of beta-naphthol used in a beta-naphthol developing bath?
- 0.5%
- 1%
- 2%
- 5%
Correct Answer: 1%
Correct Answer Explanation: The beta-naphthol developing bath, used in the diazotization and developing process, typically uses 1% of beta-naphthol.
What is the typical amount of sodium nitrite and hydrochloric acid used in a diazotising bath for 100 lb of goods?
- 4 lb sodium nitrite, 3 lb hydrochloric acid
- 6 lb sodium nitrite, 4 lb hydrochloric acid
- 8 lb sodium nitrite, 6 lb hydrochloric acid
- 10 lb sodium nitrite, 8 lb hydrochloric acid
Correct Answer: 8 lb sodium nitrite, 6 lb hydrochloric acid
Correct Answer Explanation: The diazotising bath, used in the diazotization and developing process, typically uses 8 lb of sodium nitrite and 6 lb of hydrochloric acid for 100 lb of goods.
What is the typical percentage of tannic acid used in a tannic mordant for pale shades?
- 0.5%
- 1%
- 2%
- 5%
Correct Answer: 1%
Correct Answer Explanation: A tannic mordant, used to prepare cotton for basic dyes, typically uses 1% of tannic acid for pale shades and 3-4% for deeper shades.
What is the typical percentage of tartar emetic used in a fixing bath for a tannic mordant?
- 0.5%
- 1%
- 2%
- 5%
Correct Answer: 1%
Correct Answer Explanation: The fixing bath, used to fix the tannic mordant on the cotton fibers, typically uses 1% of tartar emetic.
What is the typical amount of alizarine, sumac extract, and lime used in an alizarine bath for 100 lb of cotton for a Turkey red dye?
- 5 lb alizarine, 2 lb sumac extract, 1 oz lime
- 8 lb alizarine, 3 lb sumac extract, 2 oz lime
- 10 lb alizarine, 3 lb sumac extract, 2 oz lime
- 12 lb alizarine, 4 lb sumac extract, 3 oz lime
Correct Answer: 10 lb alizarine, 3 lb sumac extract, 2 oz lime
Correct Answer Explanation: A typical alizarine bath for a Turkey red dye uses 10-12 lb of alizarine, 3 lb of sumac extract, and 2 oz of lime per 100 lb of cotton.
What is the typical amount of logwood extract and fustic extract used in a logwood black dye-bath for yarn in hanks?
- 5 lb logwood extract, 0.5 lb fustic extract
- 8 lb logwood extract, 1 lb fustic extract
- 10 lb logwood extract, 1 lb fustic extract
- 12 lb logwood extract, 1.5 lb fustic extract
Correct Answer: 10 lb logwood extract, 1 lb fustic extract
Correct Answer Explanation: A typical logwood black dye-bath for yarn in hanks uses 10 lb of logwood extract and 1 lb of fustic extract.
What is the chemical process called where a diazo compound reacts with a phenol or amine to form an insoluble azo dye on the fiber?
- Mordanting
- Diazotisation
- Topping
- Developing
Correct Answer: Developing
Correct Answer Explanation: Developing is the second step in the diazotization and developing process, where a diazo compound reacts with a phenol or amine to form an insoluble azo dye on the fiber.
What is the name of the process that involves treating cotton fibers with strong caustic soda solutions, causing them to swell and become more compact?
- Bleaching
- Mercerisation
- Scouring
- Dyeing
Correct Answer: Mercerisation
Correct Answer Explanation: Mercerisation is a process that treats cotton fibers with a strong caustic soda solution, leading to increased strength and dye affinity.
What type of dyes require a second bath containing a reagent like bichromate of potash or sulfate of copper to fix and develop the color?
- Direct dyes
- Basic dyes
- Acid dyes
- Sulfur dyes
Correct Answer: Sulfur dyes
Correct Answer Explanation: Sulfur dyes, which contain sulfur in their composition, often require a second bath containing a reagent like bichromate of potash or sulfate of copper to fix and develop the color.
What is the approximate percentage of impurities naturally present in raw cotton?
- 2%
- 5%
- 10%
- 15%
Correct Answer: 5%
Correct Answer Explanation: Raw cotton naturally contains around 5% impurities, including wax, fatty acids, coloring matter, pectic acid, and albumens.
What is the name of the insoluble colored compound formed by the reaction of a dye and a mordant?
- Color lake
- Color pigment
- Colorant
- Dye
Correct Answer: Color lake
Correct Answer Explanation: A color lake is an insoluble colored compound formed by the reaction of a dye and a mordant, which helps the dye bind to the fibers.
What is the name of the process of removing impurities from raw cotton fibers?
- Bleaching
- Mercerisation
- Scouring
- Dyeing
Correct Answer: Scouring
Correct Answer Explanation: Scouring is a process that removes impurities from raw cotton fibers, such as wax, grease, and dirt, to prepare them for dyeing and other finishing processes.
What is the name of the form of cellulose formed by the action of oxidizing agents, which has a higher affinity for basic dyes?
- Hydrocellulose
- Oxycellulose
- Cellulose
- Lignin
Correct Answer: Oxycellulose
Correct Answer Explanation: Oxycellulose is a form of cellulose formed by the action of oxidizing agents, and it has a higher affinity for basic dyes.
What is the name of the process that removes the natural color of cotton fibers, making them white?
- Scouring
- Bleaching
- Mercerisation
- Dyeing
Correct Answer: Bleaching
Correct Answer Explanation: Bleaching is a process that removes the natural color of cotton fibers, making them white. It involves using oxidizing agents, like chlorine or hydrogen peroxide, to break down the colored compounds in the fibers.
What is the approximate percentage of cotton fibers that can be dissolved when boiled under pressure in strong caustic soda solutions?
- 5%
- 10%
- 15%
- 20%
Correct Answer: 20%
Correct Answer Explanation: Up to 20% of cotton fibers can be dissolved when boiled under pressure in strong caustic soda solutions, demonstrating the significant impact of this chemical on the fiber structure.
What is the approximate specific gravity of nitric acid solution that forms a gelatinous hydrate of cellulose on cotton?
- 1.2-1.3
- 1.4-1.5
- 1.6-1.7
- 1.8-1.9
Correct Answer: 1.4-1.5
Correct Answer Explanation: A nitric acid solution with a specific gravity of 1.4-1.5 forms a gelatinous hydrate of cellulose on cotton, demonstrating the strong interaction of this acid with the fiber structure.
What is the name of the bright red color with a bluish tone produced by a complex process involving oiling, sumacing, mordanting with alumina, dyeing with alizarine, and clearing?
- Turkey red
- Alizarine violet
- Aniline black
- Indigo
Correct Answer: Turkey red
Correct Answer Explanation: Turkey red is a highly esteemed red dye that was historically produced through a laborious and time-consuming process. It involves a series of steps, including oiling, sumacing, mordanting with alumina, dyeing with alizarine, and clearing.
What is the name of the process that involves treating cotton fabrics with a solution of cupra-ammonium to create a waterproof surface?
- Mercerisation
- Diazotisation
- Topping
- Willesden process
Correct Answer: Willesden process
Correct Answer Explanation: The Willesden process involves impregnating cotton fabrics with cupra-ammonium solutions, creating a waterproof surface. It was a popular method for making waterproof clothing and other textiles.
What is the name of the deep black dye produced by oxidizing aniline on the cotton fiber using various methods?
- Turkey red
- Alizarine violet
- Aniline black
- Indigo
Correct Answer: Aniline black
Correct Answer Explanation: Aniline black is a deep black dye produced by oxidizing aniline on the cotton fiber using various methods. It is a widely used dye in textiles, leather, and other industries.
What is the name of the group of dyes that contain sulfur in their composition and are dyed in baths containing soda and salt?
- Direct dyes
- Basic dyes
- Acid dyes
- Sulfur dyes
Correct Answer: Sulfur dyes
Correct Answer Explanation: Sulfur dyes, a group of dyes containing sulfur in their composition, are typically dyed in baths containing soda and salt. They often require a second bath containing a reagent like bichromate of potash or sulfate of copper to fix and develop the color.
What is the name of the process that involves adding a dye to already dyed fabric to brighten or modify the shade?
- Mordanting
- Diazotisation
- Topping
- Developing
Correct Answer: Topping
Correct Answer Explanation: Topping is a dyeing technique where a dye is added to already dyed fabric to modify the shade, typically to brighten or deepen the color.
What is the name of the process that involves converting an amine into a highly reactive diazo compound?
- Mordanting
- Diazotisation
- Topping
- Developing
Correct Answer: Diazotisation
Correct Answer Explanation: Diazotisation is a key process in the production of azo dyes. It involves converting an amine into a highly reactive diazo compound, which can then be coupled with a phenol or amine to form an insoluble dye on the fiber.
What is the name of the process that involves treating cotton fibers with a strong caustic soda solution to increase their strength and dye affinity?
- Bleaching
- Mercerisation
- Scouring
- Dyeing
Correct Answer: Mercerisation
Correct Answer Explanation: Mercerisation involves treating cotton fibers with a strong caustic soda solution, which causes them to swell and become more compact, resulting in increased strength and dye affinity.
What is the name of the process that involves treating unsized paper with strong sulfuric acid to produce a waterproof and greaseproof surface?
- Mercerisation
- Diazotisation
- Topping
- Parchmenting
Correct Answer: Parchmenting
Correct Answer Explanation: Treating unsized paper with strong sulfuric acid for a short period, followed by rinsing, produces a waterproof and greaseproof surface, creating what is known as parchment paper.
What is the name of the type of dyes that dye cotton, linen, and other vegetable fibers directly from a plain bath?
- Direct dyes
- Basic dyes
- Acid dyes
- Sulfur dyes
Correct Answer: Direct dyes
Correct Answer Explanation: Direct dyes, also known as substantive dyes, are able to dye cotton, linen, and other vegetable fibers directly from a plain bath without the need for mordants. They were a significant development in cotton dyeing, simplifying the process and expanding the range of available colors.
What is the name of the type of dyes that require cotton to be mordanted with tannic acid before dyeing?
- Direct dyes
- Basic dyes
- Acid dyes
- Sulfur dyes
Correct Answer: Basic dyes
Correct Answer Explanation: Basic dyes, also known as cationic dyes, have a positive charge and require a negatively charged mordant, such as tannic acid, to bind to the fibers.
What is the name of the group of dyes that require metallic mordants like alumina, chrome, and iron to create insoluble color lakes on the fibers?
- Direct dyes
- Basic dyes
- Mordant dyes
- Sulfur dyes
Correct Answer: Mordant dyes
Correct Answer Explanation: Mordant dyes, such as alizarine, require metallic mordants like alumina, chrome, and iron to create insoluble color lakes on the fibers.
What is the name of the process that involves removing impurities from raw cotton fibers, preparing them for dyeing and other finishing processes?
- Bleaching
- Mercerisation
- Scouring
- Dyeing
Correct Answer: Scouring
Correct Answer Explanation: Scouring is a process that removes impurities from raw cotton fibers, such as wax, grease, and dirt, preparing them for dyeing and other finishing processes.
What is the name of the group of dyes that require a second bath containing a reagent like bichromate of potash or sulfate of copper to fix and develop the color?
- Direct dyes
- Basic dyes
- Acid dyes
- Sulfur dyes
Correct Answer: Sulfur dyes
Correct Answer Explanation: Sulfur dyes, a group of dyes containing sulfur in their composition, typically require a second bath containing a reagent like bichromate of potash or sulfate of copper to fix and develop the color.
What is the name of the group of dyes that are highly reactive and require a diazotisation step followed by a developing step to form an insoluble azo dye on the fiber?
- Direct dyes
- Basic dyes
- Mordant dyes
- Diazo dyes
Correct Answer: Diazo dyes
Correct Answer Explanation: Diazo dyes, also known as azo dyes, are a group of dyes that are highly reactive and require a diazotisation step followed by a developing step to form an insoluble azo dye on the fiber. This process allows for a wide range of colors with good fastness properties.
What is the name of the process that involves treating cotton fabrics with a solution of cupra-ammonium to create a waterproof surface?
- Mercerisation
- Diazotisation
- Topping
- Willesden process
Correct Answer: Willesden process
Correct Answer Explanation: The Willesden process involves impregnating cotton fabrics with cupra-ammonium solutions, creating a waterproof surface. It was a popular method for making waterproof clothing and other textiles.
What is the name of the process that involves oxidizing aniline on the cotton fiber to create a deep black dye?
- Turkey red
- Alizarine violet
- Aniline black
- Indigo
Correct Answer: Aniline black
Correct Answer Explanation: Aniline black is a deep black dye produced by oxidizing aniline on the cotton fiber using various methods. It is a widely used dye in textiles, leather, and other industries.
What is the name of the traditional process for bleaching cotton for dyeing with alizarine, typically using 2.5-3 lb of lime per 100 lb of goods?
- Madder bleach
- Turkey red bleach
- Warp bleaching
- Hank bleaching
Correct Answer: Turkey red bleach
Correct Answer Explanation: The Turkey red bleach process, a traditional method for bleaching cotton for dyeing with alizarine, typically uses 2.5-3 lb of lime per 100 lb of goods.
What is the name of the process that involves treating cotton fabrics with a solution of strong caustic soda to make them shrink and thicken, increasing their strength and dye affinity?
- Bleaching
- Mercerisation
- Scouring
- Dyeing
Correct Answer: Mercerisation
Correct Answer Explanation: Mercerisation involves treating cotton fibers with a strong caustic soda solution, which causes them to swell and become more compact, resulting in increased strength and dye affinity.
What is the name of the process that involves removing impurities from raw cotton fibers, preparing them for dyeing and other finishing processes?
- Bleaching
- Mercerisation
- Scouring
- Dyeing
Correct Answer: Scouring
Correct Answer Explanation: Scouring is a process that removes impurities from raw cotton fibers, such as wax, grease, and dirt, preparing them for dyeing and other finishing processes.
What is the name of the process that involves oxidizing aniline on the cotton fiber using various methods to create a deep black dye?
- Turkey red
- Alizarine violet
- Aniline black
- Indigo
Correct Answer: Aniline black
Correct Answer Explanation: Aniline black is a deep black dye produced by oxidizing aniline on the cotton fiber using various methods. It is a widely used dye in textiles, leather, and other industries.
What is the name of the type of dyes that are highly reactive and require a diazotisation step followed by a developing step to form an insoluble azo dye on the fiber?
- Direct dyes
- Basic dyes
- Mordant dyes
- Diazo dyes
Correct Answer: Diazo dyes
Correct Answer Explanation: Diazo dyes, also known as azo dyes, are a group of dyes that are highly reactive and require a diazotisation step followed by a developing step to form an insoluble azo dye on the fiber. This process allows for a wide range of colors with good fastness properties.
What is the name of the group of dyes that contain sulfur in their composition and are dyed in baths containing soda and salt?
- Direct dyes
- Basic dyes
- Acid dyes
- Sulfur dyes
Correct Answer: Sulfur dyes
Correct Answer Explanation: Sulfur dyes, a group of dyes containing sulfur in their composition, are typically dyed in baths containing soda and salt. They often require a second bath containing a reagent like bichromate of potash or sulfate of copper to fix and develop the color.
What is the name of the process that involves removing the natural color of cotton fibers, making them white?
- Scouring
- Bleaching
- Mercerisation
- Dyeing
Correct Answer: Bleaching
Correct Answer Explanation: Bleaching is a process that removes the natural color of cotton fibers, making them white. It involves using oxidizing agents, like chlorine or hydrogen peroxide, to break down the colored compounds in the fibers.
What is the name of the type of dyes that require cotton to be mordanted with tannic acid before dyeing?
- Direct dyes
- Basic dyes
- Acid dyes
- Sulfur dyes
Correct Answer: Basic dyes
Correct Answer Explanation: Basic dyes, also known as cationic dyes, have a positive charge and require a negatively charged mordant, such as tannic acid, to bind to the fibers.
What is the name of the type of dyes that dye cotton, linen, and other vegetable fibers directly from a plain bath?
- Direct dyes
- Basic dyes
- Acid dyes
- Sulfur dyes
Correct Answer: Direct dyes
Correct Answer Explanation: Direct dyes, also known as substantive dyes, are able to dye cotton, linen, and other vegetable fibers directly from a plain bath without the need for mordants. They were a significant development in cotton dyeing, simplifying the process and expanding the range of available colors.
What is the name of the process that involves treating unsized paper with strong sulfuric acid to produce a waterproof and greaseproof surface?
- Mercerisation
- Diazotisation
- Topping
- Parchmenting
Correct Answer: Parchmenting
Correct Answer Explanation: Treating unsized paper with strong sulfuric acid for a short period, followed by rinsing, produces a waterproof and greaseproof surface, creating what is known as parchment paper.
What is the name of the process that involves treating cotton fibers with a strong caustic soda solution to increase their strength and dye affinity?
- Bleaching
- Mercerisation
- Scouring
- Dyeing
Correct Answer: Mercerisation
Correct Answer Explanation: Mercerisation involves treating cotton fibers with a strong caustic soda solution, which causes them to swell and become more compact, resulting in increased strength and dye affinity.
What is the name of the process that involves removing impurities from raw cotton fibers, preparing them for dyeing and other finishing processes?
- Bleaching
- Mercerisation
- Scouring
- Dyeing
Correct Answer: Scouring
Correct Answer Explanation: Scouring is a process that removes impurities from raw cotton fibers, such as wax, grease, and dirt, preparing them for dyeing and other finishing processes.
What is the name of the process that involves oxidizing aniline on the cotton fiber using various methods to create a deep black dye?
- Turkey red
- Alizarine violet
- Aniline black
- Indigo
Correct Answer: Aniline black
Correct Answer Explanation: Aniline black is a deep black dye produced by oxidizing aniline on the cotton fiber using various methods. It is a widely used dye in textiles, leather, and other industries.