How to make soap?
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This is the easiest way: you'll need laundry soda, vegetable oil and salt.
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Make a strong soda solution and make it hot.
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Pour the hot solution into a jar and then mix the vegetable oil adding it drop by drop into the solution until the oil stops to dissolve.
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Add some salt into the solution.
This technic is called "graining".
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Solid soup will rise to a surface so you'll be able to collect it.