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Liquid Castile Soap: Olive Oil Boiled with Caustic Potash
Kjetil Ree (Wikimedia Commons) · CC BY-SA 3.0
Charlie

Imeundwa na

Charlie

14. Oktoba 2026DE
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Liquid Castile Soap: Olive Oil Boiled with Caustic Potash

Potash makes a soft soap where soda makes a hard one, and soft soap dissolves easily, so an olive-oil potash soap thinned with water is liquid castile soap. The boiling follows the soft-soap practice Andrew Ure described in 1839: oil and caustic potash lye added by turns and boiled gently until the paste turns clear. The picture: Norwegian green soap (grønnsåpe), another soft soap of fat and potash lye.
Kati
Half a day

Maagizo

1

Make two lyes

Dissolve caustic potash in water to make a weak lye (hydrometer 1.05) and a strong one (1.20). Add the potash to the water, not the water to the potash.

Vifaa kwa hatua hii:

Hidroksidi ya potasiamuHidroksidi ya potasiamu190 g
MajiMaji1 lita

Zana zinazohitajika:

Mizani ya mizani-mbiliMizani ya mizani-mbili
Kipima-uzito wa majimajiKipima-uzito wa majimaji
Bikari ya kiooBikari ya kioo
Miwani ya kinga dhidi ya kemikaliMiwani ya kinga dhidi ya kemikali
Glavu za mpiraGlavu za mpira
2

Oil and weak lye

Heat part of the olive oil to nearly 100 °C, stir in some weak lye and bring it to the boil. Add more oil and weak lye by turns until all the oil is in.

Vifaa kwa hatua hii:

Mafuta ya zeituniMafuta ya zeituni1 kg

Zana zinazohitajika:

Birika la ChumaBirika la Chuma
Sahani ya Kupasha JotoSahani ya Kupasha Joto
Kijiko cha MbaoKijiko cha Mbao
Miwani ya kinga dhidi ya kemikaliMiwani ya kinga dhidi ya kemikali
Glavu za mpiraGlavu za mpira
3

Boil gently with strong lye

Keep it at the gentlest boil, adding a little strong lye now and then. The froth settles, the paste turns clear and thickens.

Zana zinazohitajika:

Birika la ChumaBirika la Chuma
Sahani ya Kupasha JotoSahani ya Kupasha Joto
Kijiko cha MbaoKijiko cha Mbao
Miwani ya kinga dhidi ya kemikaliMiwani ya kinga dhidi ya kemikali
Glavu za mpiraGlavu za mpira
4

Test on a glass plate

Cool a dab on a sheet of glass. It is done when it is clear, not milky, and a thin opaque ring forms round its edge (Ure: the soap has its "strength"). Then take it off the heat.

Zana zinazohitajika:

Bamba la kiooBamba la kioo
Kijiko cha MbaoKijiko cha Mbao
5

Thin it with water

Dissolve the soft soap paste in hot water, about three parts water to one of paste (our choice; add less for a thicker soap), and bottle it.

Vifaa kwa hatua hii:

MajiMaji3 lita

Zana zinazohitajika:

Birika la ChumaBirika la Chuma
Sahani ya Kupasha JotoSahani ya Kupasha Joto
Chupa yenye pampu (PET)Chupa yenye pampu (PET)
6

Potash for the oil

Inapakia daftari la Jupyter…
7

Limits

The boiling and the glass-plate test are Ure's; the quantities, the hot plate and the dilution are ours. Caustic potash lye burns skin and eyes.

Vifaa

3

Zana Zinazohitajika

10

Mchoro huu unatengeneza

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Kishikilia nafasi

Sabuni ya Kastilia (ya majimaji)

Free

190
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Kishikilia nafasi

Sabuni laini

Free

175
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Blueprint zinazohusiana

Blueprint hizi zinashiriki maarifa — mbinu, vifaa au kanuni

Caustic Potash (Potassium Hydroxide) from Potash and Slaked Lime, Ure 1839

Caustic Potash (Potassium Hydroxide) from Potash and Slaked Lime, Ure 1839

na CharlieDE

Isiyo hai

18
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Greek Olive Oil — Pressing Olive Oil with a Trapetum Mill

Greek Olive Oil — Pressing Olive Oil with a Trapetum Mill

na TheChefDK

Chakula

81
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