Effect of Cullet on the Color of White Body
In recent time, there is a growing interest in resource recovery from solid wastes which include using cullet (waste glasses) as a substitute in the formulation of ceramic bodies. All these studies hardly consider the effect of cullet on the color of the bodies so composed. This article presents a review on color and reports the investigation on the effect of cullet addition on the color of a white ceramic body. The extent to which cullet additions alter the color of white clay body was studied. Compositions of white-firing clay with various proportions of milled cullet were prepared. Ten test pieces were made for each group of test sample containing 0-100 parts CRT cullet powder. The colors and variation in the shades of hues was assessed by visual judgment, using a multiple comparisons test to determine the color differences. Results show that the addition of cullet significantly affects the whiteness of the clay body, though there are 3 groups within which there are no appreciable differences namely: 0-10parts cullet, 20part cullet and 30-50parts cullet; and that the higher the cullet addition the darker the color becomes.
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