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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.
Hagati
Half a day
Amabwiriza
1
1
Make two lyes
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.
Ibikoresho by'iyi ntambwe:
Idorokiside ya potasiyumu190 g
Amazi1 litiroIbikoresho bikenewe:
Umunzani w'ibiro
Igipima ubwuzuzanye bw'amazi
Igikombe cy'Ikirahure
Amadarubindi yo Kwirinda Ibinyabutabire
Uturindantoki tw'ikawusu2
2
Oil and weak lye
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.
Ibikoresho by'iyi ntambwe:
Amavuta ya elayo1 kgIbikoresho bikenewe:
Ibirika ry'Icyuma
Urubaho rushyushya
Ikiyiko Kibajwe mu Giti KimweAmadarubindi yo Kwirinda IbinyabutabireUturindantoki tw'ikawusu3
3
Boil gently with strong lye
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.
Ibikoresho bikenewe:
Ibirika ry'IcyumaUrubaho rushyushyaIkiyiko Kibajwe mu Giti KimweAmadarubindi yo Kwirinda IbinyabutabireUturindantoki tw'ikawusu4
4
Test on a glass plate
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.
Ibikoresho bikenewe:
Ikibaho cy'ikirahureIkiyiko Kibajwe mu Giti Kimwe5
5
Thin it with water
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.
Ibikoresho by'iyi ntambwe:
Amazi3 litiroIbikoresho bikenewe:
Ibirika ry'IcyumaUrubaho rushyushya
Icupa rifite pompe (PET)6
6
Potash for the oil
Potash for the oil
Gupakira ikaye ya Jupyter…
7
7
Limits
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.
Ibikoresho
3- Umwanya
- 4 litiroUmwanya
- 1 kgUmwanya
Ibikoresho bikenewe
10- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
- Umwanya
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