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Heat-resistant container (preferably stainless steel or resistant plastic).
Wooden spoon or hand mixer.
Silicone moulds or a container to pour the mixture into.
Protective gloves and goggles.
Well-ventilated place to work.
Preparation steps
Preparation and safety: Before you begin, make sure you wear protective gloves and goggles, as caustic soda is a corrosive product. Carry out the process in a well-ventilated place.
Dissolving the caustic soda: In a heat-resistant container, pour the 140 ml of water and, very carefully, add the 140 grams of caustic soda little by little, stirring until it dissolves completely. Remember to add the soda to the water, not the other way around, to avoid dangerous reactions.
Add the oil: Allow the caustic soda solution to cool a little. Then, slowly add the litre of oil, stirring constantly to integrate the ingredients well.
Stir in sanitizer and colorant (optional): If desired, add 150 ml of sanitizer to give the soap fragrance and antibacterial properties. You can also add a few drops of colorant to customize the look of the soap.
Stir to thicken: Keep stirring until the mixture reaches a thick, pudding-like consistency. This process can take 30 to 60 minutes.
Pour into molds: Once the mixture has reached the right consistency, pour it into silicone molds or a large container.
Let it sit: Allow the soap to sit in the molds for 24 to 48 hours to harden.
Cut and cure: After the soap has hardened, remove it from the molds and cut it into pieces. Allow it to cure for 4 to 6 weeks in a dry, ventilated place before using.
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