UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
Hard Porcelain Body: Kaolin, Felspar, Flint and Chalk, the Sèvres Paste
Coyau (Wikimedia Commons) · CC BY-SA 3.0
Mary

Yenziwe ngu-

Mary

14. uMfumfu 2026FI
20
0
0
0
0

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.
Osezingeni eliphezulu
Days to mix, months to ripen

Imiyalelo

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.

Izinto zokwakha zalesi sinyathelo:

Ucezu lwe-feldsparUcezu lwe-feldspar2 kg
AmanziAmanzi10 amalitha

Amathuluzi adingekayo:

IsithandoIsithando
Ibhakede lokupholisaIbhakede lokupholisa
Isigqulo NomgquloIsigqulo Nomgqulo
UmgquloUmgqulo
Isisefo Senetha EcolekileIsisefo Senetha Ecolekile
Amagilavu Amelana NokushisaAmagilavu Amelana Nokushisa
Imaski YothuliImaski Yothuli
2

Flint powder

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

Izinto zokwakha zalesi sinyathelo:

Igabade Letshe LomliloIgabade Letshe Lomlilo1 kg

Amathuluzi adingekayo:

IsithandoIsithando
Ibhakede lokupholisaIbhakede lokupholisa
UmgquloUmgqulo
Isisefo Senetha EcolekileIsisefo Senetha Ecolekile
Imaski YothuliImaski Yothuli
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.

Izinto zokwakha zalesi sinyathelo:

Impuphu yobumba be-kaolinImpuphu yobumba be-kaolin6.65 kg
I-calcium carbonate (umcako omhlophe)I-calcium carbonate (umcako omhlophe)0.5 kg
AmanziAmanzi15 amalitha

Amathuluzi adingekayo:

Isikali sesilinganisoIsikali sesilinganiso
Umphongolo omkhulu wokhuniUmphongolo omkhulu wokhuni
Isisefo Senetha EcolekileIsisefo Senetha Ecolekile
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.

Amathuluzi adingekayo:

Ipuleti likapulasta lodongweIpuleti likapulasta lodongwe
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.

Amathuluzi adingekayo:

Itafula lokuxova ubumbaItafula lokuxova ubumba
6

Ure's Sèvres paste, scaled

Ilayisha incwadi ye-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.

Izinto

5

Amathuluzi Adingekayo

11

Le blueprint yenza

Thumbnail
Isibambeli

Ubumba be-porcelain

Free

146
0

Ama-blueprint ahlobene

Lama-blueprint abelana ngolwazi — amasu, izinto noma izimiso

Kaolin: China Clay Washed Out of Decomposed Granite

Kaolin: China Clay Washed Out of Decomposed Granite

ngu-MaryFI

Ubumba Nodaka

19
0
0
0
0
0

CC0 Isizinda Somphakathi

Le blueprint ikhishwe ngaphansi kwe-CC0. Ukhululekile ukukopisha, ukuguqula, ukusabalalisa, nokusebenzisa ngaphandle kwemvume.

Sekela uMenzi ngokuthenga imikhiqizo nge-Blueprint yabo IKhomishane Yomenzi kumiswe ngabathengisi, noma dala inguqulo entsha yale Blueprint bese uyifaka njengoxhumaniso ku-Blueprint yakho ukuze wabelane ngemali engenayo.

Ingxoxo

(0)

Ngena ukuze ujoyine ingxoxo

Kulayishwa amazwana...