Properties and Classification of Acid Dye

Last updated on October 7th, 2023 at 11:41 pm

Acid dye is a dye used to color protein based fibres like wool, silk etc. in acidic medium. This dye is also used to color synthetic fibre like nylon but not used to color cellulosic fibre like cotton or linen. This dye is so called because it requires an acidic medium to fix the color effectively.

Properties and Classification of Acid Dye

Properties of Acid Dye

  • This dye is normally soluble in water.
  • Most of the dyes bear sodium salt of sulphonic acid and carboxylic acid.
  • Dyeing process is normally done in acid medium.
  • Protein fibre like silk, wool and polyamide fibre like nylon etc. are most suitable for dyeing with acid dye.
  • These dyestuffs give varieties of color shade.
  • Color fastness property is good.

Classification of Acid Dye

According to Chemical Structure

According to chemical structure analysis we may classify this dye as following ten:

  1. Nitro
  2. Nitroso
  3. Mono Azo
  4. Diazo
  5. Triphenyl methane
  6. Xanthan
  7. Azin
  8. Quinaline
  9. Ketorenine
  10. Anthraquinone

According to Application

  1. Strong (Class – 1)
  2. Weak (Class – 2)
  3. Neutral (Class – 3)

Properties of Strong Acid Dye

  • Dye leveling property is very good.
  • Strong acids are generally used in this bath.
  • Its light fastness property is excellent but wet fastness property is not so good.
  • Here we always have to maintain the PH value 2-3.

Ex: Lissmine green

Properties of Weak Acid Dye

  • Dye leveling property is moderate.
  • Weak acid is used in the dyeing bath.
  • Pvalue is maintained 5.2 – 6.2.
  • Washing fastness property is good.
  • It can be used for cellulosic fibre dyeing.

Ex: Solway blue – B.N.S

Properties of Neutral Acid Dye

  • Dye leveling power is very poor. So, its usage is very rare.
  • Neutral medium is used for dyeing.
  • PH value around 7.
  • Light fastness property is good.
  • Washing fastness property is also good.

Ex: Coomassic navy blue – 2RNS

You may also like: Notes on Reactive Dye

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He is Abu Sayed, the founder of the blog site Textile Apex. He is a Textile Engineer having eight years plus practical experience in the Textile and Clothing industries. With a deep love for fashion and a keen eye for detail, he combines his creative flair with extensive knowledge to offer insightful and engaging content to his readers.
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