Their normal practice seems to have been to review the large quantities of tributary ware given to them, keeping what they wanted and redistributing the remainder as part of their lavish gifts to officials, temples, and foreign rulers, and perhaps also selling some.
Ru ware represents one of the Five Great Kilns identified by later Chinese writers.
The wares were reserved for the Imperial court, with according to one contemporary source only those they rejected reaching a wider market.
Specifically, rocks gathered from recently erupted Mt.
Ngauruhoe in New Zealand gave isochron dates of between 270,000 years and 3.9 billion years—from rocks known to be less than 60 years old! Models, no matter how elegant their mathematics, are only as good as their assumptions and how well they reproduce reality through observation and experimental data.
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The unstable nature of carbon 14 (with a precise half-life that makes it easy to measure) means it is ideal as an absolute dating method.
The other two isotopes in comparison are more common than carbon-14 in the atmosphere but increase with the burning of fossil fuels making them less reliable for study (2); carbon-14 also increases, but its relative rarity means its increase is negligible. After this point, other Absolute Dating methods may be used.
Its existence was predicted by Dmitri Mendeleev in 1869, though it was not identified until 1923, making it the penultimate stable element to be discovered (rhenium was identified two years later).