In soil mechanics, plasticity is determined by measuring the increase in content of water required to change a clay from a solid state bordering on the plastic, to a plastic state bordering on the liquid, though the term is also used less formally to describe the facility with which a clay may be worked.
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Whatever the situation is, you need to check with yourself that you are not feeling compromised or pressured to get involved with something you are not comfortable about. If someone says they want to keep it secret at the beginning, make sure you agree how long the beginning will be, are we talking weeks or months, and why do they want to keep it secret?
Secrets have an uncanny way of coming out and you need to be prepared for the consequences when your relationship comes to light.
The composition of porcelain is highly variable, but the clay mineral kaolinite is often a raw material.
Other raw materials can include feldspar, ball clay, glass, bone ash, steatite, quartz, petuntse and alabaster.
Porcelain was first developed in China around 2,000 years ago, then slowly spread to other East Asian countries, and finally Europe and the rest of the world.