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GLAZING Ceramic and Earthenware

GLAZING Ceramic and Earthenware. Henry Moore. Glazing Steps. Keep bisqueware clean – keep hands clean when glazing Remove all dust from bisqueware before glazing Keep glaze mixed well Apply 2-3 coats of glaze Allow each coat to completely dry before applying next coat

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GLAZING Ceramic and Earthenware

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  1. GLAZINGCeramic and Earthenware

  2. Henry Moore Glazing Steps • Keep bisqueware clean – keep hands clean when glazing • Remove all dust from bisqueware before glazing • Keep glaze mixed well • Apply 2-3 coats of glaze • Allow each coat to completely dry before applying next coat • DO NOT glaze the bottom (area touching table) • Gloss Glazes: • Apply 2-3 coats – will be glossy • Underglazes: • Apply 2-3 coats – will not be glossy • Apply 2-3 coats of CLEAR gloss glaze on top of underglaze to make it glossy

  3. 4 Types of Glazing

  4. Dipping, Pouring & Spraying • Dip entire piece into glaze • Only 1 coating (1 dip) • Self-levels • Our Hi-fire glazes are dip • Wax the bottom to prevent glazing • Glaze must be mixed well • Use tongs to dip • Cover tong marks with paintbrush & same glaze

  5. Brush Glazing • Wet the bristles of the paintbrush • Mix glaze well • Brush on glaze in 2-3 coats with a paintbrush • Use soft bristle paintbrush • Be sure glaze is on the brush • Never leave brush in the glaze bottle

  6. Gloss Glazes • Glaze is a layer of GLASS on your pottery • Read LABEL to be sure you have the desired color • Shake well with your hand on the lid • 2-3 Coats • Will be glossy when fired • Has some transparency • High areas lighter in color • Deep and textured areas pool glaze and look darker • “moves” like glaze

  7. Before & After Firing • Three coats – let each layer dry in between • Will be chalky when dry • Glaze will change in the kiln – becomes brighter and glossy • Underglaze is not shiny unless clear gloss coated

  8. Gloss Glazes • “Move” and drip like glaze

  9. Gloss Glazes • More likely to drip If :: • Too thick • Overlaps with other glaze

  10. Gloss Glazes – TransparencyAlways check the samples & labels • Transparent Gloss Glazes • Most glosses have some transparency • High areas lighter in color • Deep and textured areas pool glaze and look darker • Opaque Gloss Glaze • Opaque glazes cover evenly – no transparency • Be sure to have amed-high relief texture for interest • Both are good for highly detailed carvings

  11. Gloss GlazesCrystaltex and Special Glazes • Crystaltex Glazes • Gloss glaze with small elements that burst when fired and add color specks • Mix well – chunks settle to bottom of jar • Special Glazes • Textured • Matte • Crackle

  12. Gloss GlazesCrystaltex and Special Glazes • Good for non-detailed, smooth and all-over surfaces • Not good for detailed surfaces – may cover up intended design

  13. Underglazes • Small bottles • 2-3 coats • Will NOT be glossy when fired • Is opaque if enough coats are applied • Must have clear gloss glaze applied if glossiness is desired • 2-3 coats of clear in addition to underglaze

  14. Underglazes • Will not drip – stays where it is painted • Great for :: • Details • Shading • Lettering

  15. Underglazes • Clear glaze MUST be applied to make the glaze glossy • It will cover the entire piece with the clear glaze color – ours is pink

  16. Underglazes • Can overlap dark colors over light colors • Needs 2-3 coats of each color even when overlapping

  17. Glazing Tips

  18. Paper Stencil • Draw/print design on paper and cut out • Lay directly on clay to trace, or glaze over

  19. Light Pencil Drawing • Draw design lightly in pencil on piece – graphite will fire away in kiln

  20. Glazing Defects

  21. Glazing Defects • Crazing • Most common glaze defect • Occurs when glaze cools too fast, or glaze does not fit clay body • “pinging” • Crackle Glaze • sought after

  22. Glazing Defects • Pin holing • Small dots of unglazed areas • Occurs when gasses in the glaze bubble to the surface, pop bubbles and do not heal over • Remedy • Wipe off dust before glazing • Allow glaze to dry completely

  23. Glazing Defects • Blistering • Glaze bubbles like lava on the surface • Occurs when gasses in the glaze bubble to the surface, but do not pop • Remedy • Wipe off dust before glazing • Allow glaze to dry completely

  24. Glazing Defects • Crawling • Glaze pulls together and forms separate droplets on surface • Occurs when there is bad adhesion to the bisque • Remedy • Be sure bisqueware is clean • Do not apply to burnished surfaces

  25. Glazing Defects • Shiver • Glaze pulls away from the surface and cracks off • Occurs when glaze doesn’tshrink as much as the clay • Remedy • Be sure bisqueware is clean

  26. Henry Moore Glazing Steps • Keep bisqueware clean – keep hands clean when glazing • Remove all dust from bisqueware before glazing • Keep glaze mixed well • Apply 2-3 coats of glaze • Allow each coat to completely dry before applying next coat • DO NOT glaze the bottom (area touching table) • Gloss Glazes: • Apply 2-3 coats – will be glossy • Underglazes: • Apply 2-3 coats – will not be glossy • Apply 2-3 coats of CLEAR gloss glaze on top of underglaze to make it glossy

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