Sovereignty Module: Refine the White

Refine the White
Refine the White
Complete Porcelain Making: From Kaolin to Translucent Ceramic
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Complete Porcelain Making: From Kaolin to Translucent Ceramic

Porcelain is the most refined ceramic material. This campaign covers porcelain clay bodies, throwing techniques for porcelain, trimming, glazing, and firing to achieve translucency and whiteness.

Chapter 1: Porcelain vs Stoneware

PropertyStonewarePorcelain
Primary clayBall clay, fire clayKaolin (china clay)
ColorGray, brown, buffWhite
TranslucencyNonePossible when thin
PlasticityGoodPoor (requires additives)
Throwing difficultyModerateHigh
Firing temperatureCone 6-10Cone 8-12
StrengthHighVery high
SurfaceVariedSmooth, refined

Chapter 2: Porcelain Clay Body

IngredientPercentagePurpose
Kaolin (EPK or Grolleg)25-50%White color, refractory
Silica (flint)20-30%Glass former, strength
Feldspar20-30%Flux, translucency
Ball clay5-15%Plasticity, workability
Bentonite1-3%Additional plasticity

Chapter 3: Throwing Porcelain

ChallengeCauseSolution
Soft, floppy wallsLow plasticityThrow thicker, trim to final thickness
Cracking during throwingOverworkingFewer pulls, work quickly
Warping during dryingUneven thicknessEven walls, slow drying
Slumping during firingVitrification softens claySupport with kiln furniture
S-cracks in bottomUneven compressionCompress bottom thoroughly

Chapter 4: Porcelain Glazes

GlazeCharacterBest Application
Clear glazeTransparent, shows clay bodyCarved or painted decoration
CeladonJade green, pools in recessesCarved porcelain
Chun (Jun)Blue, opalescentSmooth forms
Copper redRich red, difficultSpecial pieces
Iron decorationBrown/black brushwork on whitePainted porcelain
UnglazedSmooth, white, matteSculptural forms

Chapter 5: Historical Porcelain Traditions

TraditionOriginPeriodCharacteristics
Chinese blue and whiteJingdezhen, China14th centuryCobalt painting under clear glaze
CeladonLongquan, China10th centuryJade green glaze, carved
MeissenGermany18th centuryEuropean porcelain, painted
SèvresFrance18th centurySoft paste, richly decorated
Arita/ImariJapan17th centuryOverglaze enamel decoration
KoreanKorea12th centuryCeladon, inlaid decoration

Reference Card

  1. Porcelain is the most demanding ceramic material (its low plasticity, tendency to warp, and high firing temperature make porcelain the most challenging clay to work with; mastering porcelain is a lifetime pursuit). 2. Kaolin is the essential ingredient (kaolin, or china clay, provides the whiteness and refractoriness that define porcelain; without high-quality kaolin, true porcelain is impossible). 3. Translucency is porcelain's signature (when thrown thin enough and fired to full vitrification, porcelain transmits light; this translucency is the quality that has made porcelain prized for centuries). 4. Slow drying prevents cracking (porcelain is more prone to cracking during drying than stoneware; dry porcelain pieces slowly and evenly, wrapped in plastic for the first several days). 5. Trim to final thickness (because porcelain is difficult to throw thin, throw slightly thick and trim to final wall thickness; this approach produces more consistent results than attempting to throw thin). 6. Porcelain rewards patience (every step of porcelain making requires more care and patience than stoneware; the reward is a material of unmatched beauty, refinement, and translucency). 7. Chinese potters perfected porcelain (for over 1,000 years, Chinese potters developed and refined porcelain to the highest level; studying Chinese porcelain traditions is essential for any serious porcelain maker). 8. Porcelain is the ultimate test of the potter's skill (centering, throwing, trimming, glazing, and firing porcelain all require the highest level of skill; a beautiful porcelain piece represents the pinnacle of ceramic craft).
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