Comparison Between Reactive Dye and Azoic Dye | Comparison Between Vat Dye and Azoic Dye

Before going to comparison we should know about reactive dyes, azoic dyes and vat dyes. I have just given an introduction ob above three types of dyes.

Reactive dyes:
We have published lots of article on reactive dyes. But giving comparison among dyes I have summerised about reactive dyes. Basically reactive dyes react with fiber specially react with cellulosic fiber. Such as cotton, jute, bast fibers, viscose, flax etc. reactive dyes contains reactive groups and this group makes covalent bonds with fibers which become part of fiber.

General structure of any reactive dye can be presented as follows:

W – D – Q – RG – X


W = Solubilized group
D = Dye chromophores
Q = Bridging group
RG = Reactive group
X = leaving group

Azoic dyes:
Azoic dyes are not ready-made dyes but are produced by reaction of two components those are Diazocomponent or Base/Salt and Coupling component. The colored substance formed azoic dye from these essentially colorless compound is insoluble in water and the washing fastness of the shade is excellent.

Vat dyes:
The word “Vat” means Vessel. The dye takes their generic name from vetting. The vat dyes are insoluble in water, thus can’t be directly applied and required vatting. Among all the dyes, it has the best fastness properties.

Comparison of dyes
Fig: Comparison of dyes
Vat Dye vs Azoic Dye
  1. Azoics are economical than Vat dyes.
  2. Bright reds, oranges and deep maroon shades are possible in Azoics.
  3. Limited Shade range in Azoics.
  4. Bright pinks, bright Blue . olive green, green and blacks are not possible in Naphthols.
  5. No fear of photodegradation in Naphthols.
  6. Rubbing na dlight fastness is inferior in Naphthol dyeing.
  7. More Suitable for Tie-dye and space dyeing.
Reactive Dye Vs Azoics Dye
  1. Limited shade range in Azoics.
  2. Dyeing method is very complex with too many variables in naphtholation , diazotisation and developing baths.
  3. Color fastness to Chlorine is better in naphthols.
  4. Rubbing and Light fastness are inferior in azoics.
  5. Dark and bright reds , maroons and ornages can be produced in azoics which are difficult in reactives.
  6. Azoics are suitable for Tie-dye and space dyeing.
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Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.

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