Dyeing and Printing

Dyeing And Printing 3(2+1)

Lesson 01 : Facts About Dyes

Terminology Related To Dyes And Dyeing

1. Auxochrome intensify the hue of the dye molecules colour and makes the dye molecule soluble in water.


2. Bleeding is colour loss in water


3. Crocking is colour loss from rubbing or abrasion.


4. Colour flare or Metamerism: when two or more types of fabrics are dyed, particularly by different dyers, the colours may appear to match in one light (day light) but will not match in another light (incandescent light).


5. Chromophore is the colour producing portion of the dye molecule.


6. Dye: The molecules of the organic compounds called dyes are responsible for the colour of the dyed and printed fibre textile materials.


7. Dye process is the environment created for the introduction of dye by hot water, steam, or dry heat.


8. Dye lot number: Once a colour has been selected, it is essential that its formulation be kept consistent and so each batch that is dyed must have its Dye lot number.


9. Fluorescent dye glows under ultraviolet light. It absorbs light at the wave length and remits that energy at another wave length. These dyes are used in safety clothing to increase visibility.


10. Migration: shifting of colour to the surrounding area or to an adjacent surface.


11. Pigments are insoluble colour particles that are held on the surface of fabric by binding agents. Their application is simple, quick and economical.