COLOR CO-ORDINATES AND RELATIVE COLOR STRENGTH OF REACTIVE DYE INFLUENCED BY FABRIC GSM AND DYE CONCENTRATION

Abstract

Role of dye concentration as well as fabric GSM on relative color strength and color coordinates were examined by spectral analysis. Spectral analysis of cotton fabric dyed with C.I. Reactive Yellow 145 has recorded maximum absorption at 430nm wavelength by using Kubelka-Munk theory, which allows the prediction of spectral reflectance of colorants in terms of absorption and scattering coefficients at same wavelength. The dyed fabric samples were tested in Datacolor 650(reflectance spectrophotometer) to get the difference in color coordinates (DL*, Da*, Db*, DC* and DH*). This paper focused on the effects of fabric GSM and dye concentration on color coordinates and relative strength of color. The color strength of a dyed fabric is usually expressed by its k/s value. Color strength of dyed samples is relatively increases with the increase of fabric GSM and this value indicates maximum at higher GSM. On the other hand, color coordinates also changed as the changes with fabric GSM and dye concentration. Fabrics became darker when the colorant concentrations increased. Samples showed evidence of more redness and yellowness than the standard. Saturation level of dye also influenced positively in most cases i.e more intensive in higher areal density (GSM) of fabric.