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Hard Soap Boiled from Tallow and Soda Lye, Framed and Wire-Cut, Ure 1839
Malene Thyssen, simplified by HLHJ (Wikimedia Commons) · CC BY 2.5
Charlie

Dicipta oleh

Charlie

14. Oktober 2026DE
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Hard Soap Boiled from Tallow and Soda Lye, Framed and Wire-Cut, Ure 1839

Hard soap is tallow boiled with caustic soda lye; potash would give soft soap. Andrew Ure (1839): run the lye through soda and quicklime, boil the tallow with weak lye, draw the spent lye off and boil again with stronger lye day by day, then ladle the soap into a frame and cut it with a brass wire into bars. Caustic lye burns skin and eyes: goggles and gloves. The picture: a bar of hard soap.
Pertengahan
A week

Arahan

1

Run the lye

Fit a barrel with a perforated false bottom covered by cloth and a tap beneath, like Ure's vats. Put in a layer of quicklime, then alternate layers of ground soda ash and lime. Pour on water and draw off the clear caustic lye. Make some weak (hydrometer about 1.040) and some strong (up to 1.160).

Bahan untuk langkah ini:

Natrium Karbonat (abu soda)Natrium Karbonat (abu soda)2 kg

Alatan diperlukan:

Kapur tohorKapur tohor
Tong kayuTong kayu
Kain (untuk Menapis)Kain (untuk Menapis)
AirAir
HidrometerHidrometer
Baldi logamBaldi logam
Gogal Percikan KimiaGogal Percikan Kimia
Sarung tangan getahSarung tangan getah
2

First boils

Melt the tallow in the cauldron, add weak lye and boil gently about 4 hours, stirring. Test on a knife blade: when the lye runs off the soapy paste at once, it has taken. Let it stand an hour and ladle off the spent lye beneath.

Bahan untuk langkah ini:

Lemak haiwanLemak haiwan5 kg

Alatan diperlukan:

Kawah besi tuang besarKawah besi tuang besar
Kayu ApiKayu Api
Pendayung kayuPendayung kayu
Pisau dapurPisau dapur
SendukSenduk
Neraca dua piringNeraca dua piring
Gogal Percikan KimiaGogal Percikan Kimia
Sarung tangan getahSarung tangan getah
3

Stronger lyes

Repeat with fresh lye, a little stronger each day, drawing the spent lye off each time, until the paste stays firm on cooling.

Alatan diperlukan:

Kawah besi tuang besarKawah besi tuang besar
Kayu ApiKayu Api
Pendayung kayuPendayung kayu
SendukSenduk
HidrometerHidrometer
Gogal Percikan KimiaGogal Percikan Kimia
Sarung tangan getahSarung tangan getah
4

Frame and cut

Skim the pan and ladle the soap into a wooden frame. After two days take the frame off, cut the block into slabs with a brass wire, then the slabs into bars, and stand them to harden.

Alatan diperlukan:

SendukSenduk
Acuan sabunAcuan sabun
Dawai loyang halusDawai loyang halus
Pisau dapurPisau dapur
Sarung tangan getahSarung tangan getah
5

Soap from your tallow

Memuatkan buku nota Jupyter…

Bahan

2

Alatan Diperlukan

16

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