Dyeing Techniques Quiz

What is the main difference between synthetic and natural dyes?

• Synthetic dyes are derived from plants, while natural dyes are lab-made.

• Natural dyes bond better to fibers than synthetic dyes.

• Synthetic dyes provide more consistent colors and stronger bonding.

• Natural dyes offer a wider range of colors than synthetic dyes.

Which of the following fibers is best dyed using acid dyes?

• Cotton

• Wool

• Polyester

• Acrylic

How do fiber reactive dyes bond with cellulose fibers like cotton?

• Ionic bonding

• Covalent bonding

• Hydrogen bonding

• Van der Waals forces

What type of dye is best suited for polyester fibers?

• Direct dyes

• Disperse dyes

• Acid dyes

• Fiber reactive dyes

What is Depth of Shade (DOS)?

• The total amount of fabric used in dyeing

• The measure of a dye’s water solubility

• The intensity of color in a dyed fabric

• The temperature required for dyeing

What role do chromophores play in dye molecules?

• They dissolve dye in water

• They bond with fabric fibers

• They absorb specific wavelengths of light, creating color

• They increase dye solubility

How does pH affect acid dyes?

• Acid dyes require a low pH to bond with fibers

• Acid dyes work best in an alkaline environment

• Acid dyes do not require a specific pH

• Acid dyes only work at neutral pH

Which of the following fibers is most compatible with fiber reactive dyes?

• Wool

• Cotton

• Nylon

• Silk

What happens if the temperature is too low during the dyeing process?

• The dye molecules do not penetrate the fiber well

• The fabric shrinks

• The dye forms a permanent bond faster

• The fiber dissolves

Why do disperse dyes require heat for dyeing polyester?

• Heat helps dissolve the dye in water

• Heat opens up the fiber structure, allowing the dye to penetrate

• Heat changes the fiber to make it acidic

• Heat is needed to activate a chemical reaction with the fiber