“Experimental Study to Evaluate The Effect of Physico-Chemical Treatments on Color Fastness Rates of Some Natural Dyes and Pigments on Different Cellulosic Manuscripts with Practical Applications in The Field.”

Abstract

The principle work presented in the thesis was undertaken with a view of studying the effect of conservation treatments on the color strength (K/ S) and color stability of some natural dyes mordanted with citric acid, tannic acid, and chitosan treated paper. this work are to understand the technique of dyeing paper with natural dyes and their optical properties so that the paper conservators can make better decisions about the colorants selected for conservation treatments of art of works on paper. Some coloring materials including natural dyes are used for paper dyeing purposes. The unmordanted and mordanted paper samples are presented and discussed through the following topics: Section 1: Dye ability and Color intensity (K/S) values of dyed paper The dye ability of selected dyed samples was investigated through measuring the color intensity (K/S) values which were evaluated from the reflection spectra at proper wavelength. Paper samples (cotton pulp) were dyed with three natural dyes (Saffron dye, Turmeric dye and cochineal dye) the samples were post treated with (lemon juice, tannic acid and chitosan treated paper). 1.1 Color measurements Measurement of color strength(K/S); the depth of color or color strength of dyed paper samples was analyzed by K/S value through the Munk equation, the most useful model for colorants when dyes exhibit properties of light absorbing and scattring. This value numerically