Slips, Engobes and Terra Sigillatas - Alfred's Clay Store

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• Much like a clay body, slip ingredientsusually include:–Clays– Fluxes– Fillers• A slip may also require:– Hardeners– Opacifiers– Colorants• These additions depend on the composition of the slip
Clays• Chosen for their relative color and shrinkage• Light colored clays are necessary for a wide pallet ofcolors– Especially true when developing light colors• Combinations of kaolin and ball clay are normallyused to adjust shrinkage– More ball clay = more shrinkage– More kaolin = less shrinkage– Total clay is usually between 40-80%• Improve slip’s adherence to the body in dry state• Help keep slip in suspension• Improve the brushing qualities of non-plastics
Page 1 and 2: Slips,Engobesand TerraSigillatasLec
Page 3 and 4: Glazing over slips• Great way to
Page 5: Formulating slips• A slip can be
Page 9 and 10: Hi Soda3110Hi Calcium/Boron3124Hi C
Page 11 and 12: Hardeners• Used to improve hardne
Page 13 and 14: Colorants• Can be added as either
Page 15 and 16: Slip compositions• Note changes i
Page 17 and 18: Wet vs. Bisque• Wet application s
Page 19 and 20: The shrinkage myth• Many bisque-a
Page 21 and 22: Terra Sigillata• Dense, silky-smo
Page 23 and 24: • Ball mill ingredientsand place
Page 25 and 26: Like GeologyMaking a Terra Sigillat
Page 27 and 28: Drawbacks to Terra Sigillata• Gla
Page 29 and 30: • Extreme thickness change from t
Page 31: Multiple firings,then cut on abrick
Page 35 and 36: SpackleExampleCone 04Raw Claw10Calc
Page 37 and 38: Vitreous vs. Non-VitreousV.C. 5 vit
Page 39 and 40: Robert SperrySteve Heinemann
Page 41 and 42: Solutions to cracking in dryingstag
Page 43 and 44: Cracking due to trapped air• Slip
Page 45 and 46: Cracking after firing• Can also b
Page 47: Shivering!
Page 50 and 51: Using a pintool as athicknessgaugeT

Slips, Engobes and Terra Sigillatas - Alfred's Clay Store

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