Main Article Content
In this research, a glaze mixture is formulated from a group of acidic, basic and neutral compounds, according to specific weight ratios, to produce glass that matures at a low temperature to be applied on the surface of the pottery body. With the addition of tin oxide in different weight percentages from (1 - 8%), with the glass mixture and within the composition to study the effect of this dark oxide on the nature of the surface, color and tactile results of the ceramic object, (in One hour),Where the copper oxide works on coloring the block of glass to be a colored base through which the effect of the darkness oxide (SnO2) appears), and investing the difference in the density coefficient, surface tension and the degree of melting between copper oxide and tin oxide to create a liquid darkness inside the glass layer through the feature (phase - phase) A gradation was made in the percentages of addition to study the effect of this characteristic clearly through the different percentages, And the most important results were
1- The ratio (1-2%) did not give clear results due to the smelting action of copper oxide.
2- The percentage (3-4%) of the color became less intense with the appearance of small color spots on the surface.
3- A percentage (5-6%) of the appearance of color spots on the surface.
4- A percentage (7-8%) of a clear spread of the achromatic spots due to the difference in density and tensile strength.