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What you need to know before you apply

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Presentation on theme: "What you need to know before you apply"— Presentation transcript:

1 What you need to know before you apply
Glaze What you need to know before you apply

2 What is Glaze? Glaze: a vitreous coating to a ceramic material whose primary purposes are decoration or protection consists of ground glass and color pigments that when heated to extreme temperatures in a kiln create a non-porous surface.

3 What is in glaze? Silica: Finely ground glass, has a high melting point Flux: Lowers melting point of silica. I.e. Lead Alumina: Gives glaze stability and adhesion. Coloring oxide additives: Tin: White Iron: Brown Cobalt: Blue Copper: Green Vanadium: Yellow

4 Glaze Preparation Dry ingredients and water are mixed together to form a smooth, even consistency. Similar in appearance to a very thick cream.

5 If thin, ask for my assistance
Proper glaze mixing If Lumpy, continue to mix or strain Stir the glaze thoroughly with a whisk or your hand in the bucket before applying. Check the bottom of the bucket to check to feel if the glaze is thoroughly mixed from top to bottom. The mixed glaze should be the consistency of thick cream. If thin, ask for my assistance

6 Before glazing… Wax Resist!
Creates a barrier that resists glaze adhesion to the bisque ware. Why is this important? Rules: Wax bottom 1/4” of piece After glazing, wipe excess glaze from waxed area with sponge

7 Immersing piece directly into glaze
Technique 1 Dipping Immersing piece directly into glaze Wax foot Dip and hold for 3 seconds (Single color dipping only requires one dip) Let drain, fill finger (tong) marks when dry Wipe excess glaze off of foot

8 Double window dipping okay
Be careful with triple window dipping!

9 Technique 2 Brushing Best technique for hand-built work
Nice for piece with multiple areas of different colors 3 medium coats as a rule Some glazes may require up to 6 coats We will use mostly this method of applying glaze

10 Technique 3 Pouring Best for large bowls, platters, and plates Must use a container to collect excess glaze This is an advanced technique and we will generally have no need for it in C/S/3D I

11 Technique 4 Spraying Sprayed on glaze with specialized equipment in spray booth After applied, do not touch! Nice for fading colors together We used to have a spray booth!

12 Special Techniques Sponge Patterning
A sponge can be cut to give a raised pattern look Pattern the piece with a contrasting glaze

13 Special Techniques Wax Resist Design
Brush design on bisque ware with wax Dip, paint, pour, or sponge on the color over the wax design

14 Special Techniques Underglaze
Brush multi color design on bisque ware with sumi brush and cover with clear or semi-opaque glaze

15 Special Techniques Sumi Overglaze
Brush single color design on glazed piece with sumi brush Use banding wheel to paint straight lines

16 Special Techniques Oxide decoration
Red or Black iron oxide wash can enhance the texture of the piece. Not a glaze, and is not glossy Apply, and then wash off of highlights

17 Special Techniques Lusters
Very low fire metallic Applied over previously glazed work Expensive!

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