Ever wonder why your grandmother prizes her bone china collection and won't let anyone under 50 use it? Bone china is expensive, because it takes a huge amount of time and many steps to produce, some of them only by hand! Nevertheless, bone china is actually sturdier than anyone realizes. Take our quiz to find out why grandma should at least let you wash the dishes.
To which category of tableware does bone china belong?
What makes bone china so strong?
It is put through the kiln more times than fine china and regular porcelain.
It has calcined bone ash incorporated into it.
It is made from porcelain, which is a really sturdy material.
How many main processes are there in making bone china?
What are the main ingredients that go into the final mix used to make bone china?
bone ash, china clay, ball clay, flint, feldspar
bone ash, china clay, water
china clay, regular clay, bone clay, flint, feldspar
Which color china does the Lenox factory produce most?
Both the white and ivory clay mixtures are the color gray. How does the Lenox factory know which is which?
They add green vegetable dye to the ivory mix.
They label the barrels and storage containers.
The white mixture is much thicker than the ivory.
When making bone china, after the final mix is prepared it is pumped into a filter press. What does the filter press do to it?
It filters out impurities that may have accidentally mixed in.
It removes air and water from the mix.
It forms it into tubes called pugs.
When making bone china, the final mix is put through an extruder. What does an extruder do to it?
It forms it into sheets of clay.
It forms it into tubes called pugs and removes more air.
I reduces its moisture content by a further 10 percent.
About how much does a clay plug weigh?
20 pounds (9.1 kg)
30 pounds (13.6 kg)
100 pounds (45.5 kg)
When making bone china, the pugs of clay are stacked into pyramids. Why are the pug pyramids then covered with plastic wrap?
to facilitate easy shipping
to protect the clay from dirt and dust particles floating around the factory
to maintain the correct level of humidity
Metal master molds are used in the production of bone china. Why are the molds sprayed with a soapy mixture?
to help release the molds later on in the process
to clean off any dust or dirt
to help preserve the molds and make them last longer
At the molding stage in bone china production, how many people does it take to fill a metal mold with plaster?
When producing bone china, plaster molds are made from metal molds. Why can't just the metal molds be used?
Plaster molds draw out more moisture from the clay, something which metal molds can't do.
Metal molds will melt when exposed to the heat of the kilns.
The clay does not adhere well to the metal molds.
How many times can some plaster molds be used?
Dinner plate molds can be used 100 times.
Each mold can be used a maximum of 10 times.
Dinner plate molds last for years, molds for more delicate items for about six months.
What does a greenware plate refer to?
a line of Lenox bone china
an ivory china plate that is green from dye
a china plate before it has been through the kiln
When producing bone china, how are handles attached to cups?
via a profiling machine
via a jiggering unit
To harden a raw clay plate into bone china, it is put through a bisque kiln. How hot does the kiln get?
212 degrees Fahrenheit (100 degrees Celsius)
1,832 degrees Fahrenheit (1,000 degrees Celsius)
2,290 degrees Fahrenheit (1,254 degrees Celsius)
What is a vibratory finish?
a process which makes a piece of china microwave safe
a process which polishes and smoothes the china
another term for the glazing process
What can a glazed piece of china be decorated with?