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Hard Porcelain Body: Kaolin, Felspar, Flint and Chalk, the Sèvres Paste
Coyau (Wikimedia Commons) · CC BY-SA 3.0
Mary

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Mary

14. Oktoba 2026FI
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Hard Porcelain Body: Kaolin, Felspar, Flint and Chalk, the Sèvres Paste

Hard porcelain is white kaolin made just fusible enough with ground felspar. Andrew Ure (1839) gives the Sèvres paste: 63–70 parts washed kaolin, 22–15 felspar, about 10 flint powder and 5 chalk, mixed as slips, stiffened on plaster and left to ripen damp for months before it is trodden and used. The picture: centring porcelain paste on the wheel in the Grand Atelier of the Sèvres manufactory.
Juu
Days to mix, months to ripen

Maagizo

1

Calcine and grind the felspar

Pick felspar free of dark mica and rust. Heat it red hot in the kiln and quench it so it crumbles, then crush and grind it very fine with water and sift.

Vifaa kwa hatua hii:

Kipande cha feldspaKipande cha feldspa2 kg
MajiMaji10 lita

Zana zinazohitajika:

TanuruTanuru
Ndoo ya kupoza chumaNdoo ya kupoza chuma
Kinu na mchiKinu na mchi
Kisagio cha mkonoKisagio cha mkono
Ungo wa Matundu MembambaUngo wa Matundu Membamba
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
Barakoa ya vumbiBarakoa ya vumbi
2

Flint powder

Calcine and quench flint the same way and grind it to a fine powder with water.

Vifaa kwa hatua hii:

Jiwe la ChalingaJiwe la Chalinga1 kg

Zana zinazohitajika:

TanuruTanuru
Ndoo ya kupoza chumaNdoo ya kupoza chuma
Kisagio cha mkonoKisagio cha mkono
Ungo wa Matundu MembambaUngo wa Matundu Membamba
Barakoa ya vumbiBarakoa ya vumbi
3

Weigh and mix the slips

Weigh the dry kaolin, felspar, flint and chalk in Ure's proportions, stir each into water and mix them into one smooth slip; pass it through a fine sieve.

Vifaa kwa hatua hii:

Unga wa udongo wa kaoliniUnga wa udongo wa kaolini6.65 kg
Kaboneti ya kalsiamu (chaki nyeupe)Kaboneti ya kalsiamu (chaki nyeupe)0.5 kg
MajiMaji15 lita

Zana zinazohitajika:

Mizani ya mizani-mbiliMizani ya mizani-mbili
Hodhi kubwa la mbaoHodhi kubwa la mbao
Ungo wa Matundu MembambaUngo wa Matundu Membamba
4

Stiffen on plaster, ripen

Pour the slip onto plaster bats to draw the water out without heat. When it is a soft paste, store it covered and damp for months to ripen.

Zana zinazohitajika:

Bamba la jasi la ufinyanziBamba la jasi la ufinyanzi
5

Tread and ball it

Before use, work the paste hard on the wedging table (Sèvres trod it barefoot) until even, and keep it in damp balls.

Zana zinazohitajika:

Meza ya kukanda udongoMeza ya kukanda udongo
6

Ure's Sèvres paste, scaled

Inapakia daftari la Jupyter…
7

Limits

The recipe and handling are Ure's; calcining the flint and the batch size are ours. Grinding flint and felspar makes fine silica dust that harms the lungs over time: grind wet and wear a mask.

Vifaa

5

Zana Zinazohitajika

11

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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Kaolin: China Clay Washed Out of Decomposed Granite

Kaolin: China Clay Washed Out of Decomposed Granite

na MaryFI

Keramik na Udongo

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