Difference between revisions of "AY Honors/Ceramics/Answer Key 2"

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==1. Tell briefly the history of early ceramics.== <!--T:1-->
 
 
It is believed that the earliest pottery wares were hand-built and fired in bonfires. Firing times were short but the peak-temperatures achieved in the fire could be high, perhaps in the region of 900 degrees Celsius, and were reached very quickly. Early bonfire-fired wares were made with rounded bottoms, to avoid sharp angles that might be susceptible to cracking. The earliest intentionally constructed kilns were pit-kilns or trench-kilns; holes dug in the ground and covered with fuel. Holes in the ground provided insulation and resulted in better control over firing.
 
It is believed that the earliest pottery wares were hand-built and fired in bonfires. Firing times were short but the peak-temperatures achieved in the fire could be high, perhaps in the region of 900 degrees Celsius, and were reached very quickly. Early bonfire-fired wares were made with rounded bottoms, to avoid sharp angles that might be susceptible to cracking. The earliest intentionally constructed kilns were pit-kilns or trench-kilns; holes dug in the ground and covered with fuel. Holes in the ground provided insulation and resulted in better control over firing.
  
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==2. Know what is meant by the following terms:== <!--T:9-->
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;a. Greenware: Unfired clay items that have been made.
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;b. Bisque: Fired unglazed objects of clay. Clay that has been fired in a kiln.
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;c. Decal: A design printed with ceramic colors on special paper, which can be applied to the surface of ware and fired for permanency.
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;d. Kiln: A heating chamber used for hardening and maturing clay and glazes.
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;e. Glaze: A fired finish consisting of a prepared mixture of '''frit''' that produces a glass-like surface when fired.  '''Frit''' is glass that has been melted, cooled and ground to a fine powder.
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;f. Slip: Clay in liquid form.
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;g. Mender: A product used to repair broken greenware, or attach '''stick-ons'''. ('''Stick-ons''': handles, knobs or any attachments to greenware)
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;h. Stain: Acrylic type of non-fired paint used to decorate bisque.
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==3. Explain the use of cones in kilns. == <!--T:17-->
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<!-- 3. Explain the use of cones in kilns. -->
 
Cones are a necessary, vital tool in ceramics, signalling the user that the correct firing time and temperature have been reached.
 
Cones are a necessary, vital tool in ceramics, signalling the user that the correct firing time and temperature have been reached.
  
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*b) Large cones also known as witness cones are used in automatic computerized kilns. As the kiln is automatic they are used to check how the kiln has fired once opened, signalling any problems.
 
*b) Large cones also known as witness cones are used in automatic computerized kilns. As the kiln is automatic they are used to check how the kiln has fired once opened, signalling any problems.
  
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==4. Know how and when to use underglaze, glaze and stain. == <!--T:19-->
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'''Underglaze''' can be used on greenware or bisque and is applied with a brush or sponge.
 
'''Underglaze''' can be used on greenware or bisque and is applied with a brush or sponge.
  
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'''Stain''' is used for decorating bisque. It can be applied using a brush or sponges. The stain goes on the bisque before the glaze.
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'''Stain''' is used for decorating bisque. It can be applied using a brush or sponges. The stain goes on the bisque before the glaze.
  
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==5. Know what tools are used in completing your projects in ceramics. == <!--T:22-->
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There are endless tools used in completing a ceramic project, including:
 
There are endless tools used in completing a ceramic project, including:
 
* Brushes
 
* Brushes
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* etc.
 
* etc.
  
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The difference between glaze and food-safe glaze is that glaze is used on anything other than surfaces that come in contact with food or drink, and food-safe glaze can be used on any dinnerware, such as mugs, bowls, plates, serving dishes, etc.
 
The difference between glaze and food-safe glaze is that glaze is used on anything other than surfaces that come in contact with food or drink, and food-safe glaze can be used on any dinnerware, such as mugs, bowls, plates, serving dishes, etc.
  
 
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Regular glaze contains lead and some toxins. Food-safe glaze is completely lead-free and non-toxic.
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Regular glaze contains lead and some toxins. Food-safe glaze is completely lead-free and non-toxic.
  
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==7. Complete two of the following using underglaze on one item, and food-safe glaze on the second item: == <!--T:25-->
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===a. Cookie jar ===
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<big><big>'''Note: Candidate need not do the firing.'''</big></big>
 
<big><big>'''Note: Candidate need not do the firing.'''</big></big>
  
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==References== <!--T:28-->
 
==References== <!--T:28-->
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*History of Ceramics taken from excerpts in Wikepedia under heading "[https://en.wikipedia.org/wiki/Pottery| Pottery]".
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*History of Ceramics taken from excerpts in Wikipedia under heading "[https://en.wikipedia.org/wiki/Pottery| Pottery]".
 
*Other definitions obtained from Mrs. Doris Wade, owner and operator of Xclusive Creations, a pottery studio in Bermuda. Compiled by Eileen King, Director of the Warwick Longtails Pathfinder club in Bermuda.
 
*Other definitions obtained from Mrs. Doris Wade, owner and operator of Xclusive Creations, a pottery studio in Bermuda. Compiled by Eileen King, Director of the Warwick Longtails Pathfinder club in Bermuda.
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Latest revision as of 12:26, 13 August 2021

Other languages:
English • ‎español
Ceramics

Skill Level

2

Year

1956

Version

24.11.2024

Approval authority

North American Division

Ceramics AY Honor.png
Ceramics
Arts, Crafts and Hobbies
Skill Level
123
Approval authority
North American Division
Year of Introduction
1956
See also
Artisan Master Award



1

Tell briefly the history of early ceramics.


It is believed that the earliest pottery wares were hand-built and fired in bonfires. Firing times were short but the peak-temperatures achieved in the fire could be high, perhaps in the region of 900 degrees Celsius, and were reached very quickly. Early bonfire-fired wares were made with rounded bottoms, to avoid sharp angles that might be susceptible to cracking. The earliest intentionally constructed kilns were pit-kilns or trench-kilns; holes dug in the ground and covered with fuel. Holes in the ground provided insulation and resulted in better control over firing.

The earliest pottery ware found to date was excavated from a cave in southern China.

The invention of the potter's wheel in Mesopotamia revolutionized pottery production. Potters were able to work quickly and produce pottery to meet the expanding needs of the world's first cities.

Ceramics began in China 6,000 years ago during the New Stone Age whose advent was marked by the invention pottery. The earliest earthenware was moulded by hand and the potter's wheel was something that came much later. In the beginning, clay was fired at a temperature of about 500-600 degrees celsius. Painted pottery began to be known during the period of Yangshao and Longshan Cultures.

The large legion of terra-cotta soldiers and horses of the Qin Dynasty (221 - 207 B.C.) which were discovered in the province of Shaanxi in 1974, are eloquent proof of the high skills in kiln-firing and sculpture attained at that early age. The art of pottery reached another peak of development in the Tang Dynasty (618 - 907 A.D.), as evidenced by the renowned "tri-coloured glaze."

Wucheng Village of Qingjiang County, Jiangxi Province vessles of blue-glazed ware have been unearthed. Upon examination, they proved to have been made of kaolin and fired at high temperatures of 1,200C. Their surface is coated with a glaze, whose chemical composition is very close to that of their bodies. Certain procelains of the Song (960 - 1279) and Ming (1368 - 1644) dynasties were already celadon, though at its early stages.

Chinese ceramics became known to the world at large from the Tang Dynasty so much so that the word "china" became the name of procelain. Chinese procelain, together with Chinese tea and silk flowed through the Silk Road and other land and sea routes to foreign countries.


The quality of pottery has varied historically, depending on the reputation the potter made for himself in his community.


2

Know what is meant by the following terms:


2a

Greenware



2b

Bisque



2c

Decal



2d

Kiln



2e

Glaze



2f

Slip



2g

Mender



2h

Stain




3

Explain the use of cones in kilns.


Cones are a necessary, vital tool in ceramics, signalling the user that the correct firing time and temperature have been reached.

There are two types of cones:

  • a) Small cones that are used in manual kilns. They are placed between a device called a kiln sitter, when they have melted or deformed the kiln shuts off.
  • b) Large cones also known as witness cones are used in automatic computerized kilns. As the kiln is automatic they are used to check how the kiln has fired once opened, signalling any problems.


4

Know how and when to use underglaze, glaze and stain.


Underglaze can be used on greenware or bisque and is applied with a brush or sponge.

Glaze is used after you have decorated your bisque. Can be applied using a brush or dipping decorated bisque in a container of glaze. This glaze gives your bisque a glass finish once fired in a kiln.

Stain is used for decorating bisque. It can be applied using a brush or sponges. The stain goes on the bisque before the glaze.


5

Know what tools are used in completing your projects in ceramics.


There are endless tools used in completing a ceramic project, including:

  • Brushes
  • sponge
  • decals
  • stamps
  • stencils
  • kiln
  • etc.


6

Know the difference between glaze and food-safe glaze.


The difference between glaze and food-safe glaze is that glaze is used on anything other than surfaces that come in contact with food or drink, and food-safe glaze can be used on any dinnerware, such as mugs, bowls, plates, serving dishes, etc.

Regular glaze contains lead and some toxins. Food-safe glaze is completely lead-free and non-toxic.


7

Complete two of the following using underglaze on one item, and food-safe glaze on the second item:


7a

Cookie jar



7b

Pie plate



7c

Vase



7d

Flower planter



7e

Candy dish



7f

Mug



7g

Item of your choice


Go find a ceramic studio and get creating. Most importantly, have fun!

Note: Candidate need not do the firing.




References

  • History of Ceramics taken from excerpts in Wikipedia under heading "Pottery".
  • Other definitions obtained from Mrs. Doris Wade, owner and operator of Xclusive Creations, a pottery studio in Bermuda. Compiled by Eileen King, Director of the Warwick Longtails Pathfinder club in Bermuda.
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