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.(due to its having the same number of valence electrons, being in the same group, but also to relativistic effects; the expected expansion of atomic radii from period 5 to 6 is almost exactly cancelled out by the lanthanide contraction).
Vernon Cupps’ recent radioactive dating Impact articles.
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.
The pieces are mostly fairly small, for drinking, use at a scholar's desk, incense burning, or as small containers.
Hafnium is a chemical element with symbol Hf and atomic number 72.
A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals.