DYES

• According to the article by artTECA, people are exposed to color psychology as soon as they are born. For example, baby girls’ dresses are commonly in pink while boys are in blue.
• Colors have the power to reveal one’s feeling, emotions, identity and taste on fashion.
• Dyes

  • Organic compounds widely used for imparting color to textiles
  • Produced from natural or synthetic resources
  • Absorbed in the pores of the fibers, not building up on the surface
• Reasons dyes are absorbed in the pores of fibers

  1. The dye molecules are smaller than the size of the pores of the fibers

  2. There is affinity between the dye and the fiber due to the force of attraction
• Dyes

  • Unique properties:
  • Absorb light in the visible spectrum (400-700 nm)
  • Have at least one chromophore (color-bearing group)
  • Have a conjugated system with alternating double and single bonds
  • Exhibit resonance of electrons
• It is very important that the chromophore must be a part of the conjugated system.
• AZOIC DYES (Naphthol dye)


  • Tie-dye (Fast dye or jobus)
• A dye should have greater affinity to its SUBSTRATE rather than its MEDIUM
• NATURAL DYES - obtained from natural sources
• Mauveine - first synthetic dye from coal tar
• Indigo - brilliant blue color made from fermented leaves of a plant
• Red Lac Dye- extracted from LAC, a secretion of a tiny insect
• Iron oxide - gives brown color
• Buff - derived from ferrous sulphate
• MIRIB - natural dye
• AUXOCHROMES - also known as color helpers
• AUXOCHROMES - shift the color of the dye
• AUXOCHROMES - attach dye to the fiber
• AUXOCHROMES - influence dye solubility
• BATOCHROMIC SHIFT - also known as red shift
• BATOCHROMIC SHIFT - peak signal is longer wavelength and has lower energy
• BATOCHROMIC SHIFT - increases adbsorption and intensity of colors
• HYPSOCHROMIC SHIFT - blue shift
• HYPSOCHROMIC SHIFT - peak signal is shorter wavelength and has higher energy
• HYPSOCHROMIC SHIFT - decreases absorption and intensity of colors
• ACID DYES - anionic dyes
• ACID DYES - nylon, wool, silk, leather
• ACID DYES - carry a negative charge and are attracted to polyamides with positive charge
• ACID DYES - applied in acidic conditions
• ACID DYES - inexpensive, light fast but not wetfass
• BASIC DYES - cationic dye
• BASIC DYES - polyacrylics
• BASIC DYES - carry a positive charge and are attracted to polyacrylics with negative charge
• BASIC DYES - good light fast and bright shades
• BAD - synthetic dyes
• DISPERSE DYES - suitable substrates are hydrophobic substrates
• DISPERSE DYES - dissolved in polymer matrix to form solid-solid solution
• DISPERSE DYES - dispersed rather than dissolved in water
• VRAD- dyes for cellulosic polymers
• DIRECT DYES - cellulosic polymers like cotton, viscose rayon, vegetable fiber