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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. Ukwakira 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.
Hejuru
Days to mix, months to ripen

Amabwiriza

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.

Ibikoresho by'iyi ntambwe:

Igice cya feldispatiIgice cya feldispati2 kg
AmaziAmazi10 litiro

Ibikoresho bikenewe:

ItanuraItanura
Indobo yo gukonjeshaIndobo yo gukonjesha
Isekuru n'UmuhiniIsekuru n'Umuhini
Isekuru ryo gusyaIsekuru ryo gusya
Akayunguruzo Gafite Urukoma RutoAkayunguruzo Gafite Urukoma Ruto
Uturindantoki twihanganira ubushyuheUturindantoki twihanganira ubushyuhe
Agapfukamunwa k'UmukunguguAgapfukamunwa k'Umukungugu
2

Flint powder

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

Ibikoresho by'iyi ntambwe:

Ibuye ry'Amabuye AmurikaIbuye ry'Amabuye Amurika1 kg

Ibikoresho bikenewe:

ItanuraItanura
Indobo yo gukonjeshaIndobo yo gukonjesha
Isekuru ryo gusyaIsekuru ryo gusya
Akayunguruzo Gafite Urukoma RutoAkayunguruzo Gafite Urukoma Ruto
Agapfukamunwa k'UmukunguguAgapfukamunwa k'Umukungugu
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.

Ibikoresho by'iyi ntambwe:

Ifu y'ibumba rya kawoliniIfu y'ibumba rya kawolini6.65 kg
Kaboneti ya kalisiyumu (ifu y'umweru)Kaboneti ya kalisiyumu (ifu y'umweru)0.5 kg
AmaziAmazi15 litiro

Ibikoresho bikenewe:

Umunzani w'ibiroUmunzani w'ibiro
IgikonjoIgikonjo
Akayunguruzo Gafite Urukoma RutoAkayunguruzo Gafite Urukoma Ruto
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.

Ibikoresho bikenewe:

Ikibaho cya plâtre cy'ububumbyiIkibaho cya plâtre cy'ububumbyi
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.

Ibikoresho bikenewe:

Ameza yo kuvanga ibumbaAmeza yo kuvanga ibumba
6

Ure's Sèvres paste, scaled

Gupakira ikaye ya 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.

Ibikoresho

5

Ibikoresho bikenewe

11

Iki gishushanyo gikora

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Agateganyo

Ibumba rya porukorene

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Blueprint zijyanye

Izi blueprint zisangira ubumenyi — uburyo, ibikoresho cyangwa amahame

Kaolin: China Clay Washed Out of Decomposed Granite

Kaolin: China Clay Washed Out of Decomposed Granite

na MaryFI

Amabumba n'Ibumba

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CC0 Umurenge rusange

Iyi blueprint yasohowe munsi ya CC0. Ushobora gukoporora, guhindura, gukwirakwiza no gukoresha nta kwemererwa.

Shyigikira Umuremyi ugura ibicuruzwa binyuze muri Blueprint ye Komisiyo y'Umuremyi byashyizweho n'Abacuruzi, cyangwa kora verisiyo nshya y'iyi Blueprint ukayinjiza nk'isano muri Blueprint yawe kugira ngo musangire inyungu.

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