Heat the vegetable fat and olive oil in a microwave for a minute. You can even melt them on a gas burner on high heat.
Measure the lye (zero out the weight of the bowl) and use a spoon to scoop the lye and pour it into the water carefully. Remember, NEVER pour water into lye but always do the converse. Wait for the fumes to die down. You will be left with a cloudy-clear liquid. DO NOT touch it with bare hands.
Add the oil and vegetable fat mix to the lye and water mixture and stir using a spatula.
Add the aloe vera gel to this and stir. It will take some time for the mixture to absorb the gel and the oil. Be patient and keep stirring. Add the essential oils (and other elements) and stir.
Pour this batter into the soap mold and keep it aside (away from light, heat, and moisture). Let it set for 24 hours. Cover the mold with a towel.
Once it is hard, remove it from the mold. The soap needs at least 4 weeks for curing (time required for lye, fat, and water to turn into soap). During this period, store it in a cool and dry place.
The aloe vera soap bar is ready to use after the curing time is over.
Using The Hot Process Method
Both cold and hot processes of soap making are very similar. The only difference is that in the hot process, external heat is used for accelerating saponification. Also, hot processed soaps have less curing time.
You will need the same safety gear and ingredients that you used for making cold process aloe vera soap. Once you have gathered all your ingredients and safety gear, follow these steps: