The liquids are probably just basic glaze, so very finely powdered glass and water, and the green powder looks like pulverised dry ceramic clay to me. At Johnson tiles they had a press in which the moulds held a given quantity of the same ceramic powder and just enough water was injected to allow it to meld. Then the basic tiles were fed through a drying kiln. Then they were either biscuit fired or dipped and then fired, depending on the type of ceramic powder used. I never worked with porcelain but did learn how. A few years after I finished there, they packed up and moved to Thailand, where labour is dirt cheap. Their quality went through the floor at the same time. I don’t know where they produce them now, China I suspect.

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