How to Make Soap with Waste Oil

One of the smartest and most useful ways to reuse used oil is to turn it into excellent soap. It's a very simple process.

Necessary

Heat all the fats and oils together, maintaining a temperature of approximately 45 degrees: check with an immersion food thermometer.
Before starting to heat the oils, pour the soda into a large container and mix it with water. This will trigger a reaction that produces the "caustic solution": during this process, the water temperature increases, reaching 90°C, and then slowly begins to drop.
Wait until the caustic solution is between 45 and 50 degrees and then pour in the oils, mixing them with the help of an immersion blender.
You'll gradually notice the mixture take on a creamy consistency. Add your chosen essential oil.
Pour the still soft mixture into the mold: you can use wooden or silicone ones.
Cover the soap with cling film and a cloth for about 24 hours: you will notice that the soap will begin to solidify.
After this time, take out the soap from the molds and cut it into pieces: always use rubber gloves, the soda may still be present.
An advice , which is important. Caustic soda is not dangerous, but it is corrosive: therefore, when making soap, always wear protective glasses, rubber or latex gloves, and a mask. Also, do not use pots or pans made of caustic soda. aluminumAnd finally, don't forget to keep children away to avoid any risks.

If you prefer to avoid handling the soda, instead:

This method is ideal for beginners and for making custom soaps easily and safely.