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Study on Dyeing of Cotton Fabric with Vat Dyes
Definition of Vat Dyes:
Vat Dyes are insoluble in water and cannot be used for dyeing without modification. When treated with
a reducing agent, they are converted into water soluble leuco compounds in the presence of alkalies.
These leuco compounds are extremely substantive towards cellulose and re-oxidize to insoluble the
dyes in the presence of acid
Objective of Dyeing:
 To provide the desired color
 To obliterate the surface
 To develop the market design as per the market requirement
 To know the functions of used chemical in vat dyeing
 To know different kinds of shape according to different specific given parameter
 To improve the weathering Properties and durability
Recipe Required for Vat dyeing:
1. Vatting:
Shade % - 5%
Sequestering Agent – 1cc/L
Hydrose (Na2S2O4) - -3gm/L
NaOH- 2gm/L
Na2CO3- 3gm/L
PH- 11
Temperature- 70C
Time- 15 minutes
M:L – 1:70

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Study on Dyeing of Cotton Fabric with Vat Dyes.docx

  • 1. Study on Dyeing of Cotton Fabric with Vat Dyes Definition of Vat Dyes: Vat Dyes are insoluble in water and cannot be used for dyeing without modification. When treated with a reducing agent, they are converted into water soluble leuco compounds in the presence of alkalies. These leuco compounds are extremely substantive towards cellulose and re-oxidize to insoluble the dyes in the presence of acid Objective of Dyeing:  To provide the desired color  To obliterate the surface  To develop the market design as per the market requirement  To know the functions of used chemical in vat dyeing  To know different kinds of shape according to different specific given parameter  To improve the weathering Properties and durability Recipe Required for Vat dyeing: 1. Vatting: Shade % - 5% Sequestering Agent – 1cc/L Hydrose (Na2S2O4) - -3gm/L NaOH- 2gm/L Na2CO3- 3gm/L PH- 11 Temperature- 70C Time- 15 minutes M:L – 1:70