Spectral studies of textile optical bleach and organic dye

This paper shows the relevance of the developed spectrophotometer for the study of optical bleach and organic dye for different tissues. The paper presents a block diagram of the spectrophotometer and provides technical and operational characteristics of the device. Diffuse reflection spectra were obtained for different tissue samples, which show that the optical bleach forms a short-wave absorption band at λ ≤ 420 nm and gives a luminescent additive to the reflected radiation flux in the blue region of the spectrum λ ≈ 430–480 nm. In the region of λ ≈ 500–640 nm, the reflection coefficient decreases. A quantitative comparison of the brightness parameter B determined from the R(λ) spectra and the brightness parameter B of the white tissues was performed. The results of Be measurements were reduced to the reference value Br by linear interpolation. The interpolation error did not exceed δB ≤ 1 %. The color parameters for the X, Y, and Z coordinates were measured with an error of no more than 1 %. The diffuse reflection spectra of colored tissue samples are analyzed and the results of measurements of colorimetric coordinates are obtained.

Degree of cotton fabric whiteness obtained by the fluorescent bleaching agent UVITEX BHT and H2O2

In this paper, the influence of the fluorescent bleaching agent, UVITEX BHT optical bleach, on the degree of whiteness of cotton fabric was examined. In the first phase of the test, the bleaching of cotton with hydrogen peroxide, as the bleaching agent, was done. In the second phase, the effect of fluorescent bleaching agent on the whiteness of cotton wool bleached in the first phase was tested. Moreover, the color strength (K/S) and CIE L*a*b* were determined using Coloreye - 3000 spectrophotometer. The whiteness degree achieved with bleaching agent UVITEX BHT was almost twice larger than the one achieved with chemical bleaching compounds. The highest whiteness index (WI) of cotton fabrics was achieved when fluorescent UVITEX BHT bleach was used in the concentration of 0.1%.