Direct Dyes

directdyes

Direct Dyes

Direct Dyes are made up of fine ingredients. These dyes are appreciated for their high density, solubility, stability and color fastness. They are non toxic and hence easy to apply. They are cheap in comparison to reactive dyes.

Direct Dyes that belong to hot water dyes are used on cellulose fibres like cotton. The other type of mixture that forms acid dye is the one which is mixed in ‘all purpose dyes’ like Tintex Hot Water dye, Rit, Dylon multipurpose dye. However, these mixtures of acid dye do not stay longer on cellulose fibre.

Types of Direct Dyes

One is Anionic Direct Dyes which structural composition comprises of planar molecular structure with lot of variations. The structural single and double bonds are very much extended, containing single or multiple sulfonate groups. The sulfonate groups make Anionic Direct Dyes soluble in the water.

Another is Cationic Direct Dyes comprises of planar molecular structural composition with extended single and double bonding. Here, the positive charges are more than the negative charges.

 

SHADES PRODUCT NAME C.I.NAME
BRILLANT YELLOW 3 GX DIRECT YELLOW 6
PAPER YELLOW T DIRECT YELLOW 11
CRYSOPHENINE DIRECT YELLOW 12
YELLOW G DIRECT YELLOW 28
YELLOW 5GLL DIRECT YELLOW 44
SUPRA YELLOW RL DIRECT YELLOW 86
ORANGE SE DIRECT ORANGE 26
ORANGE GL DIRECT ORANGE 34
ORANGE 7GLL DIRECT ORANGE 37
ORANGE TGLL DIRECT ORANGE 39
VISCOSE ORANGE A DIRECT ORANGE 108
SCARLET 4BS DIRECT RED 23
RED 12B DIRECT RED 31
RED 5BR DIRECT RED 80
RED 5BL DIRECT RED 81

 

SHADES PRODUCT NAME C.I.NAME
DIRECT BROWN 3R 133% DIRECT RED 111
DIRECT LIGHT ROSE FR DIRECT RED 227
DIRECT SCARLET 6BS DIRECT RED 239
DIRECT PINK 3B (SF) DIRECT RED 254
DIRECT VIOLET MB DIRECT VIOLET 9
DIRECT HELIO B DIRECT VIOLET 51
DIRECT SKY BLUE FB DIRECT BLUE 1
DIRECT SKY BLUE FF DIRECT BLUE 15
DIRECT BLUE GLL DIRECT BLUE 71
DIRECT BLUE RLL DIRECT BLUE 80
DIRECT BRILLIANT BLUE F DIRECT BLUE 151
DIRECT T. BLUE SBL DIRECT BLUE 86
DIRECT TURQ. BLUE FBL DIRECT BLUE 199
DIRECT BLACK VB DIRECT BLACK 19
DIRECT GREY RLN DIRECT BLACK 56
DIRECT BLACK OB DIRECT BLACK 80
DIRECT BLACK AR DIRECT BLACK 168
DIRECT BLACK NA DIRECT BLACK 22
DIRECT GREEN B DIRECT GREEN 26
DIRECT GREEN NB GREEN 96
How to solve the wash fastness problem for Direct Dyes

Direct dyes give moderate to poor wash fastness properties. Direct dyes lose its color with every wash subsequently reducing its brightness. It also endangers other clothes when washed in same load. However, you can get better wash fastness if you undergo special after-treatment process. Typically, Retayne is cationic dye fixative used to glue the dye into fibre which gives better fixation of dyes into fibre. It makes direct dyes washable without any bleeding of the dye.

Limitations
  • Moderate to poor wash fastness
  • Few Direct Dyes have low lightfastness.
  • Unlike other dyes, often they provide bland and dull in color
  • Direct Dyes provide dull color in comparison to reactive dyes..
  • Direct Dyes is not suitable to dye cellulose fiber, which makes limited use of these dyes
Attributes
  • Easy to apply
  • Covers entire shade gamut
  • Excellent light fastness
  • Good levelling property
  • Inexpensive
Applications

Direct Dyes are widely used in both textile and non-textile application.Common application of Direct Dyes are made on cellulose, polyimide, silk, leather, paper, PC blends. Direct Dyes are most commonly used on cotton fibres. Anionic Direct Dyes are used for coloring papers, controlling tint, shade and corrections of two sided paper color. Direct Dyes can be used in same dye bath with Acid Dyes which is considered to be major benefit.