Papers by Keyword: Coloring Agent

Abstract: The paper presents the study by changing of Oxidizability –Reducibility of mixed batch glass material and changing the quantities of Coloring agent, Cu, in glass melting. The analysis of Spectrum Transmittance and Chroma Index have been carried out on the different sample plates obtained in the glass melting. The test results indicate: The wavelength T≥52.73% shown by the transmittance of light for the glass in the following conditions: a) When the value of COD of mixed batch glass material was equal to 473.06( i.e. the quantity amount of CuO in percentage is 0.3%) . b) When a= 0.596 and b=6.560 was shown in the Chroma Index of glass. The wavelength T = 10.33% at lowest shown by the transmittance of light for the glass in the following conditions: a) When the value of COD of mixed batch glass material was equal to 160.23( i.e. the quantity amount of CuO in percentage is 0.3% as well) b) When a= - 18.039 and b= - 9.178 was shown in the Chroma Index of glass.

Abstract: The aim of this study was focusing on the excipients interaction especially between coloring agents and diluents. There were two coloring agents with different charges ; methylene blue(M) showing positive charge while amaranth(A) giving negative charge but all having same concentration of 0.1% w/w in each mixing batch. There are five types of starch using as diluents; arrowroot starch (W), rice starch (R), cassava starch (S), corn starch (C) and lesser yam starch (l). The physical properties of starch powder and paste (5%w/v) were evaluated as angle of repose and viscosity respectively. While the concentration of both coloring agents were determined by either UV spectroscopy or eye observation. The storage conditions of all samples were kept in both light and dark area for 7 weeks. It was found in powder form that C gave the most stable of M while R gave the worst for m in both light and dark condition. M showed less influences on flow properties of starches than a in a powder state. The flow of C with M gave the best results. The W paste was shown to be the most stable physical properties. M was suitable for S paste in a dark condition. While A was suitable for C, R and W paste in a light condition. The charges of coloring agents might not be a major influence on some physical properties of starch in both powder and paste form.