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Revision - Dyes and Mordants

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  • What is a mordant?
    Colour fixing agent that allows dyes to soak better into fabric fibres
  • What is the purpose of pre-washing fabric before dyeing?
    Pre-washing removes dirt, oils, and chemicals, ensuring even dye absorption
  • What are examples of two commonly used mordants
    alum, iron, HCL,
  • Name two plant-based natural fibres and their sources.
    Cotton (from the cotton plant). Linen (from the flax plant).
  • What are synthetic fibres, and how are they made?
    Synthetic fibers are man-made fibres produced from chemical substances, often derived from petroleum
  • What are some disadvantages of natural fibres?
    They can shrink, wrinkle easily, are less durable, and may be more expensive compared to synthetic fibres.
  • What natural product would give a red coloured dye?
    Beetroot
  • What is the primary difference between natural and synthetic dyes?
    Natural dyes are derived from plants, animals, or minerals, while synthetic dyes are chemically manufactured in laboratories.
  • What effect does a mordant have on the colour produced by natural dyes?
    Mordants can alter the final colour and intensity of the dye, allowing for a range of shades from the same dye source.
  • Give three examples of synthetic fibres.
    Polyester, nylon, and acrylic.
  • Why are natural dyes considered more eco-friendly compared to synthetic dyes?
    Natural dyes are biodegradable and generally less toxic to the environment, whereas synthetic dyes may contain harmful chemicals.
  • How can the temperature of the dye bath affect the dyeing process?
    Higher temperatures often speed up the dyeing process and can intensify colours, but excessive heat might damage certain fabrics.
  • Why are synthetic fibres often blended with natural fibers?
    To combine the benefits of both, such as the comfort of natural fibers with the durability and wrinkle resistance of synthetic fibers.
  • Name two examples of natural dyes and their sources
    I will take an appropriate answer
  • What is one major advantage of synthetic fibres over natural fibres?
    Synthetic fibres are more durable, resistant to wrinkles, and often cheaper to produce.
  • What type of fibres absorbs natural dyes best?
    Natural fibres like cotton, wool, silk, and linen absorb natural dyes better than synthetic fibres.
  • Name two animal-based natural fibres and their sources.
    Wool (from sheep). Silk (from silkworms).
  • What does "colourfastness" mean in the context of dyeing?
    Colourfastness refers to a fabric’s resistance to fading or washing out over time
  • What are natural fibres, and where do they come from?
    Natural fibres are derived from plants, animals, or minerals.
  • Why is it important to handle mordants with care?
    Some mordants, like chromium salts, can be toxic and harmful to the skin and environment.
  • Why are mordants used in dying?
    Mordants improve colour fastness and enhancing the vibrancy of the colour as well as time taken to dye.
  • What is one advantage of using synthetic dyes over natural dyes?
    wider colour range, cheap, better colour fastness, more consistent quality
  • What is a key advantage of natural fibres over synthetic fibres?
    Natural fibres are breathable, biodegradable, and often more comfortable to wear.
  • What are the environmental concerns associated with synthetic fibres?
    Synthetic fibers are non-biodegradable, contribute to microplastic pollution, and require energy-intensive production processes.
  • What are the basic steps in the dyeing process using natural dyes?
    prepare the fabric, extract the dye, immerse fabric in dye, rinse and dry the dyes fabric
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