صيغ لإنتاج خلطات المزججات ذات الألوان الدافئة محليا

Abstract EN

The study aims to arrive at formulations for ceramic glaze mixtures bearing various degrees of warm colours) e.g: red, orange , and yellow) through conducting laboratory tests.

the signifying of warm – color – glazes lies in diversifying ceramics and responding to the demand for modern artistic and utilitarian design.

the study notes that most local ceramics are glazed with shades of cool colors like blue or green , which may be evidence of prevailing limitations due to lack of experimentation.

warm colored glazes are not offered locally, although some of their constituent materials are available.

the study used standardized and local materials, relying mainly on lead compounds, borax, and black lime glass as the main flux.

materials used to improve the mixtures, fusing properties were talc, potassium feldspar, and wood ash.

quartz and kaolin were used to balance the mixtures.

to achieve the desired colors, the oxides of tin titanium, selenium, cadmium and chrome were used as a samples of study, with a follow up practical method.

the mixtures were made according to proportional percentages and then fired to various temperatures, the highest of which was 1120˚c.

the results of fusing were observed and numerous tests were performed, including those measuring solidity, acid – erosion resistance, thermal shock, cracking, peeling, and the potential for reaction with alkaline substances.

the study found that it is possible to obtain the desired colors, depending on the purity of materials, their percentages within the mixture, and the equalization of the firing temperature.

some of the coloring oxides used are highly poisonous and do not totally dissolve in fusion.

some of them dissolved, with alkaline substances after dissolved, but regained react ability with alkaline substances after finishing.

therefore these colors should not be used on vessels intended for food or drink.