Presentation on theme: "What you need to know before you apply"— Presentation transcript:
1What you need to know before you apply GlazeWhat you need to know before you apply
2What is Glaze?Glaze:a vitreous coating to a ceramic material whose primary purposes are decoration or protectionconsists of ground glass and color pigments that when heated to extreme temperatures in a kiln create a non-porous surface.
3What is in glaze?Silica: Finely ground glass, has a high melting pointFlux: Lowers melting point of silica. I.e. LeadAlumina: Gives glaze stability and adhesion.Coloring oxide additives:Tin: WhiteIron: BrownCobalt: BlueCopper: GreenVanadium: Yellow
4Glaze PreparationDry ingredients and water are mixed together to form a smooth, even consistency. Similar in appearance to a very thick cream.
5If thin, ask for my assistance Proper glaze mixingIf Lumpy, continue to mix or strainStir 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
6Before glazing… Wax Resist! Creates a barrier that resists glaze adhesion to the bisque ware.Why is this important?Rules:Wax bottom 1/4” of pieceAfter glazing, wipe excess glaze from waxed area with sponge
7Immersing piece directly into glaze Technique 1 DippingImmersing piece directly into glazeWax footDip and hold for 3 seconds (Single color dipping only requires one dip)Let drain, fill finger (tong) marks when dryWipe excess glaze off of foot
8Double window dipping okay Be careful withtriple window dipping!
9Technique 2 Brushing Best technique for hand-built work Nice for piece with multiple areas of different colors3 medium coats as a ruleSome glazes may require up to 6 coatsWe will use mostly this method of applying glaze
10Technique 3 PouringBest for large bowls, platters, and platesMust use a container to collect excess glazeThis is an advanced technique and we will generally have no need for it in C/S/3D I
11Technique 4 SprayingSprayed on glaze with specialized equipment in spray boothAfter applied, do not touch!Nice for fading colors togetherWe used to have a spray booth!
12Special Techniques Sponge Patterning A sponge can be cut to give a raised pattern lookPattern the piece with a contrasting glaze
13Special Techniques Wax Resist Design Brush design on bisque ware with waxDip, paint, pour, or sponge on the color over the wax design
14Special Techniques Underglaze Brush multi color design on bisque ware with sumi brush and cover with clear or semi-opaque glaze
15Special Techniques Sumi Overglaze Brush single color design on glazed piece with sumi brushUse banding wheel to paint straight lines
16Special Techniques Oxide decoration Red or Black iron oxide wash can enhance the texture of the piece.Not a glaze, and is not glossyApply, and then wash off of highlights
17Special Techniques Lusters Very low fire metallicApplied over previously glazed workExpensive!