IṢẸ́ ỌNÀ
ẸWÀ ÀTI ÌLERA
IṢẸ́ ỌWỌ́
ÀṢÀ ÀTI ÌTÀN
ÌṢERÉ
ÀYÍKÁ
OÚNJẸ ÀTI OHUN MÍMU
REVERSE ENGINEERING
SÁYẸ́ǸSÌ
ERÉ ÌDÁRAYÁ
ÌMỌ̀-Ẹ̀RỌ
ÀWỌN OHUN WÍWỌ̀
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.
Ilọsíwájú
Days to mix, months to ripen
Ìlànà
1
1
Calcine and grind the felspar
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ìdì feldspar2 kg
Omi10 lítàÀwọn irinṣẹ́ tí a nílò:
Ìléru Ìsun
Àpótí ìtutù
Odó àti Ọmọ Odó
Ọmọ ọlọ
Ajọ Ojú Kékeré
Ìbọ̀wọ́ Tí Ń Fara Da Ooru
Ìbòjú Eruku2
2
Flint powder
Flint powder
Calcine and quench flint the same way and grind it to a fine powder with water.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ìṣù Òkúta Ìdáná1 kgÀwọn irinṣẹ́ tí a nílò:
Ìléru ÌsunÀpótí ìtutùỌmọ ọlọAjọ Ojú KékeréÌbòjú Eruku3
3
Weigh and mix the slips
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Ìyẹ̀fun amọ̀ kaolin6.65 kg
Calcium carbonate (ẹfun funfun)0.5 kgOmi15 lítàÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Ọpọ́n igi ńláAjọ Ojú Kékeré4
4
Stiffen on plaster, ripen
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.
Àwọn irinṣẹ́ tí a nílò:
Àwo pilásítà fún iṣẹ́ ìkòkò5
5
Tread and ball it
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.
Àwọn irinṣẹ́ tí a nílò:
Tábìlì ìtẹ̀ amọ̀6
6
Ure's Sèvres paste, scaled
Ure's Sèvres paste, scaled
Ń ṣí ìwé Jupyter…
7
7
Limits
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.
Àwọn ohun-èlò
5- 2 kgÀyè
- 25 lítàÀyè
- 1 kgÀyè
- 6.65 kgÀyè
- Àyè
Àwọn irinṣẹ́ tó nílò
11- Àyè
- Àyè
- Àyè
- Àyè
Ìtọ́nisọ́nà yìí ń ṣe
Blueprint tó jọra
Àwọn blueprint wọ̀nyí pín ìmọ̀ — ọ̀nà, ohun-èlò tàbí ìlànà
CC0 Àgbègbè Gbogbogbò
Blueprint yìí ti jáde lábẹ́ CC0. O lè ṣe àdàkọ, yí padà, pín, àti lò láìsí ìyọ̀ǹda.
Ṣàtìlẹ́yìn Olùṣẹ́dá nípa rírà àwọn ọjà nipasẹ̀ Blueprint wọn Ẹ̀san Olùṣẹ́dá tí àwọn Olùtajà gbé kalẹ̀, tàbí ṣẹ̀dá àtúnṣe tuntun ti Blueprint yìí kí o sì fi sínú Blueprint rẹ gẹ́gẹ́ bí ìsopọ̀ láti pín owó-wíwọlé.