Reactive dyes are colourants that form chemical bonds with textile fibres (particularly cellulose fibres like cotton). This creates permanent colour with excellent wash fastness.
How They Work
Unlike dyes that simply coat or stain fibres, reactive dyes:
- React chemically with the fibre molecules
- Form covalent bonds
- Become part of the fibre structure
This bond is permanent - the dye can't simply wash away.
Properties
Advantages:
- Excellent wash fastness
- Bright, vibrant colours
- Wide colour range
- Good light fastness
Considerations:
- Requires careful processing
- Some environmental concerns (water usage, chemicals)
- Higher processing cost than basic dyes
In Towels
Reactive dyes are standard for quality coloured cotton towels. They ensure:
- Colours don't bleed in the wash
- Colours don't fade quickly
- No colour transfer to other laundry
Budget towels may use cheaper dyes with poorer fastness.
Related Terms
- Colour fastness - What reactive dyes provide
- Vat dye - Alternative high-fastness dye
- Piece-dyed - Dyeing method