Studied by 18 people
part 1: 37 questions part 2: 14 questions matching, true and false, multiple choice
Why has the glaze crawled?
application too thick/dust on pot before glazing
should always dust off pot with damp sponge before glazing
Can I use many glazes on one pot?
no—glaze will run to the bottom and the pot will stick to kiln shelf
How long should I hold my pot in a bucket of glaze so I know it is good coverage?
3 seconds
coloring oxides and water
impart only color to a surface under a glaze or over (to give a more controlled area of color)
may be used on greenware or bisque-ware
highly concentrated so use sparingly
oxide wash
What are some glazing decorative techniques?
wax resist
coloring oxides
brush work
underglaze colors
sponging
What causes a piece to come out dry and rough to the touch?
the glaze was applied too thinly, barely covers the surface
Should you wait for glaze to dry completely to apply another coat?
no, do when slightly damp
Why is glaze cracking off piece?
too thick/too many layers of glaze
Why is wax resist on the bottom of pots important?
prevents glaze from running onto the kiln
Why isn’t glaze drying on pot after washing off unwanted application?
too much water, wait a few days to reglaze
What is the most unique and workable quality of clay?
plasticity
What are 3 types of clay bodies?
porcelain, terracotta, stoneware
What is fine china primarily made up of finely-ground cow bone?
bone china
Why do we wedge?
to get rid of air pockets
A clay object, not yet fired
greenware
Why do we put “fillers” in clay?
strength, “tooth”
3 properties that make clay different from sand or dirt
plasticity (most important)
porosity
vitrification
process of joining two pieces of clay together (while leather hard)
score and slip
What is the chemical formula for clay?
(Al2O3)•(2SiO2)•(2H2O)
quartz
important for closs
mixed with alumina to stop the “flow” so it doesn’t puddle
causes vitrification
silica
Why can’t bone dry and wet clay be attached?
it will crack
all products made from clay
ceramics
what are 3 techniques used to decorate clay?
scraffito, brushwork, carving, stamping
A receptical used to hold clay pieces and fire them
Kiln
used to coat kiln shelves to prevent glaze and clay from sticking during firing
kiln wash
What is the first firing called?
bisque
What is the difference between hand building clay and wheel throwing clay?
hand building clay has looser platelets, a lot more water in between; wheel throwing has tighter platelets
Why is it important to glaze inside of piece?
Expand and contractionÂ
defects in pottery
can result from improper mixing, application, or firing processes.
glaze faults
What are examples of glaze faults?
crawling, pinholing, blistering, crazing, and shivering
kiln firing technique where the amount of oxygen is reduced
reduction firing
kiln atmosphere is oxygen-rich
oxidation firing
cone placed in the kiln to monitor the firing process and help determine when the desired temperature has been reached
guide cone
to gauge the temperature reached inside the kiln, once this one bends the correct temp has been reached
target cone
placed alongside the target cones during a kiln firing.
serve as an additional indicator of the firing process
provides a backup measure for monitoring the temperature inside the kiln
guard cone
What are cones made up of?
ceramic/glaze material
How to prevent s-cracks?
compressing the bottom
What color does a cobalt oxide create?
blue
What is the most important part of wheelthrowing?
Centering
Note
Flashcard