MCQ Detailed View

Dyes are substances used to color fabrics. Different dyes work better with different types of fibers. Fabrics such as cotton, rayon, and some protein fibers can form hydrogen bonds. Hydrogen bonds are weak interactions between hydrogen atoms in the fabric and the dye molecules.

Direct dyes are water-soluble dyes that can attach directly to fibers without the need for a mordant or chemical treatment. They are especially useful for fabrics that can form hydrogen bonds. The dye molecules form hydrogen bonds with the fiber, making the color stick firmly. This makes direct dyes ideal for cellulose fibers like cotton.

Other types of dyes work differently. Mordant dyes require a mordant, a chemical that binds the dye to the fabric. Vat dyes are insoluble in water and need to be chemically reduced before they can dye fibers. Acid dyes are mainly used for protein fibers like wool and silk, which have amino groups that can react with the acid dyes.

Direct dyes are simple to use and give bright, uniform colors on fabrics that can form hydrogen bonds. They do not require additional chemicals to fix the dye, which makes them cost-effective and convenient for large-scale textile production.

Understanding which dye is most suitable for a specific type of fiber is important in analytical chemistry and textile applications. The ability of the fiber to form hydrogen bonds determines the effectiveness of direct dyes. This knowledge helps in selecting the right dye to achieve strong, durable, and vibrant colors on fabrics.