1. Handout by Mrs. Moore & Supplement PowerPoint by Mrs. Peachee
Ceramic Glazes
Handout by Mrs. Moore & Supplement PowerPoint by Mrs. Peachee

2. BEFORE YOU EVEN CONSIDER GLAZING…
Is your piece dry?
Do you have a design?
Did you get permission?
Did you sand your piece for any rough patches?
Did you clean your piece with a damp cloth?

3. General information Make up of Glazes: Come powder or liquid Glass
Silica
Pigment (mineral color)
Come powder or liquid

4. Slip Glazes Different colored slips (underglazes)
Can be scratched using (sgraffito technique)
Can be placed in relief cut impressions (Mashima technique)

5. General continued Liquid Glazes: Brush Can settle if left to sit
Shake well
Open and stir with the handle of brush (clean off before use)
Dry glazes can have water added to bring back to life
Brush
should be soft bristled.
Always clean your brush thoroughly when finished
dry bristle up.
Detail work requires glaze that will not flow

6. Glazes can be poured or dipped for faster application
melt at specific temperatures.
Becomes molten and seals pores
Clay molecules lose hydrogen bonds and shrink porous nature of clay.
Clay is still porous without the use of glazes.
While porous pieces can not hold water.

7. Green ware & bisque ware
Clay that has not been fired.
Often must be fired before glazed
Some underglazes may be applied prior to firing.
Firing prior to under glazing can be important for adding strength.
Bisque Ware
After kiln fired (usually cone 04)
Glazed pieces may be placed on stilts if glazed on bottom.
Can you spot the bisque Ware?

8. Safety Hazards LEAD! Silica Poisonous substance
Can NOT be used for food containers.
Can cause brain damage
Silica
In powder form you must wear a mask.
Sticks to your lungs & cause breathing problems.
WATCH YOUR LABELS
K-6 Lead free
NON-TOXIC Conforms to ASTM D-4236 LEAD-FREE
CAUTIONS REQUIRED Restricted From Use K-6 LEAD-FREE Conforms to ASTM D-4236/LHAMA
7-12 Lead free

9. Application Glazes – consistency of heavy cream Rough textures
Flows off brush
Apply 3 even coats
(2nd firing approximately 1850 degrees for 8 hours-Cone 06)
Rough textures
Water down and apply additional coats
Do not backstroke
1/16th to 1/8th inch thick (thumbnail check)
Remove excess glaze from bottom with damp sponge.

10. Types of glazes Underglazes “Matte” finish Used for details
Do not flow
Use a soft brush to apply

11. Types of Glazes TRANSPARENT Clear like water “high Gloss”
Used over an underglaze often
Food safe
Seals pores

12. Colored glaze Transparent Translucent Opaque Can see through layers
Can layer colors
Translucent
Can see partially through layers
Opaque
Can not see through layers
Blocks colors below

13. Art Glaze Contains particles that break up while firing
Specific firing setting needed
More prone to running
Unpredictable