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Difference Between Cold Saponification and Hot Saponification

What is saponification?

Humanity has been using and marketing soap for centuries. Since then the soap recipe has hardly changed. It consists of mixing fatty substances with sodium hydroxide (NaOH) or "soda". The chemical reaction between these 2 elements is what is called saponification and allows soap and glycerin to be obtained. The fatty substances present in soap production can be vegetable or animal oils or fats..
There are 2 methods of saponification: cold saponification and hot saponification.


What is hot saponification?

Commonly used in the cosmetic industry, hot saponification It consists of heating the fats and the soda. Generally, when this production method is used, the manufacturer usually adds an excess of soda to ensure that all the fat present in the preparation is transformed into soap. The mixture obtained is heated for several hours or even days, in this way the saponification process is accelerated and production is industrialized.
The "soap paste" obtained is rinsed with plenty of water in order to remove all soda residues and obtain a non-corrosive mixture that is poured into the corresponding moulds. Once cold, they can be cut into tablets to be used.
Some hot saponified soaps are very popular all over the world such as: Marseille soap (based on vegetable oils) or the aleppo soap (based on laurel oil). These soaps are well known for their cleaning properties, attractive price and durability. However, depending on the type of fats or oils used, which are not always controlled, they can be very aggressive for the skin and disrespectful to the environment. In addition to having a manufacturing method that consumes a lot of energy. 


What is cold saponification?

The cold saponification method also consists of mixing fatty materials and soda for about 20 minutes, but without heating them. In addition, contrary to hot saponification, we add in the mixture an excess of oil to make sure that all the soda reacts and thus cause a complete saponification

Let our mixture rest between 24 and 48 hours in special wooden molds. Then begins the first phase of saponification during which a natural heating of the mixture occurs. After this time, we remove the soap from its mold, cut it and leave it dry for a month. During this drying phase, the water evaporates and the saponification process takes place completely. In this way we ensure that there is no residue of soda.

Cold saponification therefore follows an artisanal process lthen due to the curing period necessary to obtain a complete reaction.


What are the advantages of cold saponified soap?

Cold saponified soaps contain glycerin naturally produced during saponification. Glycerin allows a better hydration of the skin and, therefore, better preservation. For this reason, cold saponified soaps are especially recommended for dry and sensitive skin.

Another advantage is that by not heating vegetable fats and soda, we preserve the benefits of the oil and maintain its emollient, softening, protective and nourishing properties. The cold saponification method allows maximum preservation of all components. We thus highlight the presence of vitamin E (tocopherol), an antioxidant that slows down the aging and oxidation of vegetable oils present in the soap. It is for this reason that it is even more interesting to select quality, natural, organic raw materials and avoid any pesticide or endocrine disruptor. 

Therefore, cold saponified soaps are generally a guarantee of quality. The raw materials are carefully selected, mainly organic and locally produced. Additives are generally of natural origin, such as essential oils for perfume or clay for coloring.

In addition, thanks to the preservation of the benefits of fatty oils in the cold saponification process, the feeling of the skin after washing is much more pleasant and softer than when using conventional soap.

Finally, since saponification is done cold, the energy impact of production is much lower: less energy and less water.

Choosing a cold saponified soap is choosing a quality product, respectful with our skin and with the environment.


Why have we chosen cold saponification?

En home healthy home, We are committed to quality and the environment, which is why we have chosen the cold saponification method for all our soaps.

both our laundry soaps like ours personal care soaps they are composed of carefully selected raw materials (without palm oil), of natural and organic origin. We make all our soaps with 100% organic virgin olive oil of Spanish origin.  Thus, and thanks to cold saponification, we obtain soaps that respect, care for and hydrate our skin.

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