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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.
中级
Half a day
说明
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.
此步骤所需材料：
氢氧化钾190 克
水1 升所需工具：
天平
比重计
玻璃烧杯
化学防溅护目镜
橡胶手套2
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.
此步骤所需材料：
橄榄油1 公斤所需工具：
铁壶
电热板
木勺化学防溅护目镜橡胶手套3
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.
所需工具：
铁壶电热板木勺化学防溅护目镜橡胶手套4
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.
所需工具：
玻璃板木勺5
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.
此步骤所需材料：
水3 升所需工具：
铁壶电热板
压泵瓶（PET）6
6
Potash for the oil
Potash for the oil
正在加载 Jupyter 笔记本…
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.
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