This is some seriously heady stuff. From a distance of twenty feet they look solid black. Getting closer reveals various values of black with plum and blue.
How were these created? It had to do with the oxidizing conditions in the kiln, and creating sudden temperature increases in a process known as flashing.
Common constituents were added to the clay mixture to produce colors. This brick may have had iron oxide with manganese oxide added. Vegetable materials were also added with a sudden temperature increase.
People wonder why I'm always happy.
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