Influence of Mordant Compositions on the Color Characteristics of Cotton Fabrics Dyed with Natural Dyes

The article presents the results of studying the colorimetric characteristics of dyeing cotton fabrics with natural dyes extracted from various plants native to Tajikistan (Saint-John’s wort, harmel peganum, woad, oriental plane tree bark, barberry root, rhubarb root). The influence of different mordants (MgCl₂, AlCl₃, FeCl₃, FeSО₄, Al₂(SО₄)₂, CuSO₄) on basic color characteristics such as lightness and color saturation of the dyed samples is analyzed. Spectrophotometric studies have established that the most significant changes in color characteristics occur when using iron (III) salts, which aligns with the complexing properties of transition metals and the stability of the complexes they form. The research demonstrates that using various mordants allows for obtaining a wide range of additional colors and shades. In the CIELab color system, the locations of the obtained colors are indicated on the a*, b* color chart, and the color gamuts are constructed.