Examination of laser radiation effect on silk fabrics dyed with different concentrations of cochineal using iron and alum mordants

Abstract

The present study was conducted to investigate the effect of laser radiation on the color of the silk fabric dyed with cochineal insects. Silk fabrics mordanted with ıron (II) sulfate (FeSO₄.7H₂O) and potassium aluminum sulfate (KAl(SO₄)₂12.H₂O) at different ratios were separately dyed at different concentrations using 5%, 7.5% and 10% owf of cochineal (Dactylopius coccus Costa). Then, by applying two different wavelengths of laser radiation with different pulses to the dyed silk fabric samples, the modification of the laser radiation on the fiber and dye on the fabric was examined. During laser radiation applications, a thermal infrared camera was used to measure temperature changes. The dyed fabrics were analyzed by different analytical and technical methods. The color characteristics of all the dyed silk fabrics were measured by CIEL*a*b* spectrophotometer. The color coordinates and fastness values of rubbing and light also were investigated. Morphological analysis was performed using optical and scanning electron microscopy. Elemental analysis was performed using SEM-EDX (scanning electron microscopy -energy-dispersive X-ray spectroscopy) to identify mordants. A reserved phase high-performance liquid chromatography (RP-HPLC) with the diode-array detection (DAD) method was utilized for the identification of the components of dyes present in the silk samples.

Keywords:

• Natural dyes
• silk fabric
• laser radiation
• cochineal
• HPLC
• CIEL*a*b*, SEM-EDX
• infrared thermography

Disclosure statement

No potential conflict of interest was reported by the author(s).