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The constant K/S represents the relationship between the concentration of the color and its emission value, where K is the absorption constant for a certain wavelength and S is the vertical regulation constant also for a certain wavelength (only for the material, depending on the coloring of textiles, leather or paper). As early as 1931. Kubelka and Munk came to the following mathematical relationship through their tests:
G = K/S(coloring) – K/S(substrate) = BC
G(mixture) = G color intensity 1 + G color intensity 2
Where G is the absorption measure of color for a certain wavelength; B is the constant of proportionality. It depends on the color, the wavelength, the substrate and the conditions of the dyeing. In the light and medium area of the dyeing, B is also dependent on the concentration of the dye. C – is the amount of color. In this test, polyester knit fabric (100% PES) was used as a substrate.1 Dyeing of polyester knit fabric was carried out by the exhaustion process at elevated temperature and under pressure (HT process). The dyeing fleet consists of a certain amount of TERASIL ROT W - 4BS and TERASIL GELB 4G disperse paints.2 For concentrations of 1.00% sample (1) and 4.00% for sample (2), acetic acid to achieve a certain pH value as a dispersant (UNIVADIN DP). Sample (1) was obtained by dyeing in a fleet that contained 0.50% of TERASIL ROT W - 4BS and 0.50% TERASIL GELB 4G, and sample (2) by dyeing in a fleet that contained 2.00% of the same colors, all in relation to the mass of the substrate. When obtaining measurement results, the metric program "Super MATCH 6 supplement" was used, in which spectrophotometry is used as an instrumental method. As a relatively new spectrophotometric technique, reflectometry is included, which is used to monitor the fabric dyeing process, the resistance of dyeing to light and other environmental factors, coloring specification, drawing up recapture for coloring based on samples, etc.3
Measurements and processing of the results showed that sample (1) has a maximum K/S value of 17.31 at a wavelength of 460 nm, and sample (2) has a maximum K/S value of 25.56 also at a wavelength of 460 nm. n.m. The results of this research show that the staining metric gives the possibility of calculating the unknown concentration, determining the color difference, calculating the recapture, examining the influence of different factors on the staining (concentration and pH) and in a very short time, objectively and very precisely.
