Quantifying Spectral Metamerism and CIEDE2000 Tolerance Limits in Multi-Component Garment Assembly Lines
CIEDE2000 tolerances below 0.8 dE00 prevent visual metameric mismatches between garment shells and trims under D65 and retail LED illuminants.
Cotton Reactive Dye
Chemical Colorant
Anionic chemical compounds that establish covalent bonds with the hydroxyl groups of cellulosic fibers provide high washfastness on cotton fabrics. These compounds constitute cotton reactive dye, which represents the primary class of colorants utilized for coloring cellulosic materials in modern piece-dyeing operations.
Fixation Process
The dyeing procedure relies on an alkaline environment to trigger the chemical reaction between the dye molecule and the fiber substrate. This fixation stage typically requires the addition of soda ash or sodium hydroxide to raise the pH of the dye bath, which converts the fiber’s hydroxyl groups into reactive cellulosate ions. Once the cotton reactive dye has chemically bound to the cellulose molecule, the resulting compound becomes an integral part of the fiber itself, offering exceptional resistance to wet treatments.
Performance Attribute
Mills must thoroughly wash the dyed fabric after fixation to remove any unreacted colorant from the fiber surface. Failure to complete this step leaves unbound cotton reactive dye on the fabric, which subsequently causes bleeding and staining during laundering.
Quality Control
Laboratory technicians test the washfastness of the finished textile using standardized laundering trials to confirm complete fixation. This ensures that the cotton reactive dye maintains its color integrity throughout the consumer lifecycle.