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.
|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|
|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.
- 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
- Easy to apply
- Covers entire shade gamut
- Excellent light fastness
- Good levelling property
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.