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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.
Katamtaman
Half a day
Mga Tagubilin
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.
Mga materyales para sa hakbang na ito:
Potassium hydroxide190 g
Tubig1 litroMga kailangang kasangkapan:
Timbangang panimbang
Hydrometer
Basong Salamin na Pang-agham
Salamin Laban sa Tilamsik ng Kemikal
Gwantes na goma2
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.
Mga materyales para sa hakbang na ito:
Langis ng oliba1 kgMga kailangang kasangkapan:
Takure na Bakal
Pang-init na Plato
Kutsarang KahoySalamin Laban sa Tilamsik ng KemikalGwantes na goma3
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.
Mga kailangang kasangkapan:
Takure na BakalPang-init na PlatoKutsarang KahoySalamin Laban sa Tilamsik ng KemikalGwantes na goma4
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.
Mga kailangang kasangkapan:
Plantsa ng salaminKutsarang Kahoy5
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.
Mga materyales para sa hakbang na ito:
Tubig3 litroMga kailangang kasangkapan:
Takure na BakalPang-init na Plato
Bote na may bomba (PET)6
6
Potash for the oil
Potash for the oil
Naglo-load ng Jupyter notebook…
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.
Mga Materyales
3- 190 gPlaceholder
- 4 litroPlaceholder
- 1 kgPlaceholder
Mga Kinakailangang Kasangkapan
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