Burke, Roy O.
M.A. (Master of Arts)
Department of Art
Since glazes containing earthy characteristics are of prime importance to a stoneware potter, it was the writer's intention to take a group of selected ashes (since ashes were used in glazes by some of the earliest potters known) and test them for their practical use as a major glaze ingredient. Obtaining a completely accurate chemical analysis of the ashes used in this testing appeared impossible, so it was decided to use a visual means instead of a mathematical means in calculating the different glazes. The materials obtained were first prepared in the usual time-consuming method of burning, washing, re-washing, screening, and then drying. Further investigation revealed a short-cut method in which the material was simply burned and screened, thus providing a larger amount of ash with which to experiment. Each of the ashes were then tested for their fired characteristics in a reduction atmosphere at cone 8. This testing brought out many favorable results. Using the visual method of formulating these glazes, it was necessary to also test individually some of the basic chemicals which were later added to each of the ashes. After the preliminary testing of the Individual ashes and the Individual chemicals to be used, basic mixes were devised to combine the ashes with the chemicals and thus form a glaze. Many of these combinations proved to bring satisfactory results in an oxidation atmosphere as well as a reduction atmosphere. In the problem undertaken of finding a practical approach for the use of ash as a major glaze ingredient, many glazes having the earthy qualities desired were produced. By using the visual method in obtaining these glazes, it is the belief of the writer that any potter, beginner or professional, could easily devise a satisfactory glaze using any type of ash.
Johns, Donald A., "An approach to the use of selected ashes as a major glaze ingredient" (1963). Graduate Research Theses & Dissertations. 1184.
[vi], 28 pages
Northern Illinois University
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