Direct Red Dyes
Vibrant & Reliable Coloring Solutions
Direct Red Dyes are direct azo dyes, which are easily soluble in water and attach directly to the cellulose fibres. They are also used in the production of red colors that are vibrant and uniform that can be reproducible across various dyeing batches.
Direct Red Dyes most commonly used colorants in the textile and paper industries are a very popular palette with a range of delicate pinks and bright scarlets as well as a range of deep crimsons and maroons. These aqueous dyes are valued because they are one step and they do provide strong eye catching reds on natural fibers.
In order to fully utilize the quality of the materials you are going to dye, the following technical parameters are to be taken into consideration:
- Light Fastness: 3 to 6. Direct Red 80 is highly recommended to be used as upholstery or as outdoor.
- Temperature: Optimum exhaustion (dye uptake) is usually at 95 o C -100 o C boiling point.
- Salt Control: Adding Glauber Salt (Na 2 SO 4 ) is necessary to create profound, dark tones of the dye that force it to be deposited onto the substrate.
- Fixing Treatment: To eliminate the possibility of bleeding when washing our products, we suggest to use a dye-fixing agent as a post-dye treatment.
Key Features of Our Direct Red Range
- Vivid Color Profile: High-purity formulations ensure bright, clean shades with high chroma (color intensity).
- High Substantivity: Exceptional natural bonding to cotton, viscose, and flax fibers.
- Cold & Hot Solubility: Excellent solubility profiles suitable for various machinery, from jiggers to padding mangles.
- Versatile Shading: Easily combinable with Direct Yellows for oranges or Direct Blues for deep purples and violets.
- Environmentally Conscious: Specialized non-benzidine and low-salt reds available for sustainable manufacturing.
| Popular Direct Red Dye Variants | |||
|---|---|---|---|
| Product Name | C.I. Number | Primary Applications | Key Benefit |
| Direct Red 80 | 35780 | High-end Textiles, Silk | Superior light fastness; a classic “Cherry Red.” |
| Direct Red 81 | 28160 | Paper, Cotton, Detergents | Excellent water solubility; very cost-effective. |
| Direct Red 23 | 29160 | Cotton, Viscose, Jute | Provides a warm, yellowish-red (Scarlet) tone. |
| Direct Red 227 | — | Inks, Premium Textiles | High purity and brightness; great for printing. |
| Direct Red 28 | 22120 | Biological Stains, Paper | Also known as Congo Red; high affinity for cellulose. |
Frequently Asked Questions
What are direct red dyes?
They are a class of anionic (negatively charged) synthetic organic dyes, often from the azo family, which bond with fibers through physical interactions like hydrogen bonding and Van der Waals forces, rather than a chemical reaction.
How do Direct Red dyes work?
Direct Red dyes attach to fibers through hydrogen bonding and Van der Waals forces. They have long, flat molecular structures that align well with cellulose fibers.
How should I store direct red dyes?
Store them in a cool, dry place away from direct sunlight and moisture, in tightly sealed, original containers like HDPE bags or drums, to maintain their quality and typical 2-year shelf life.
Are Direct Red dyes eco-friendly?
Some Direct Red dyes may contain azo groups, which can pose environmental concerns. Many manufacturers now offer eco-friendly and REACH-compliant grades. Always check regulatory compliance.
Are Direct Red dyes safe for skin contact?
Industrial-grade dyes are not intended for direct skin contact. For consumer products, only dyes that meet OEKO-TEX or similar safety standards should be used.