Kinds of soaps

Castile soap
Castile soap is a name used in English-speaking countries for olive oil based soap made in a style similar to that originating in the Castile region of Spain. CAstile soap is made olive oil with addition oа animal fat or synthetic substances.

Nabulsi soap is a type of castile soap produced only in Nablus in the West Bank, Palestine.[1] An olive oil-based soap, it is made up of three primary ingredients: virgin olive oil, water, and a sodium compound. Those who make the soap are proud of its unique smell, which they see as a sign of the quality and purity of its ingredients.

Aleppo soap is a vegetable oil soap that is similar to Marseille or Castile soap, but made in Aleppo, Syria.
The main constituents of Aleppo soap are olive oil and laurel Oil.

  The olive oil used is pressed from the left-overs of prior olive pressings, called "pomace" and is a green color because of the high amounts of chlorophyll (the organic compound which makes all plants green) in the pomace. This oil is used because it is cheap. Upon saponification, the olive oil loses many of its intrinsic qualities; however its high vitamin E content is thought to remain intact through to the finished product.
  Laurel oil is very expensive, and obtained, through various means, from most parts of the bay laurel tree. It is thought to have high antiseptic and antioxidative qualities. It also adds a nice scent to the soap.
 The sodium hydroxide used to affect saponification in the oils was formerly obtained from the "salsola kali" plant, which we would call a tumble weed. The plant was burned to obtain sodium carbonate in the ash, which upon a number of processes involving quick lime and water, is made into sodium hydroxide: a strong alkali.Currently, the sodium hydroxide used is obtained through various processes involving sodium chloride from sea salt.
 Aleppo Soap, being a handmade soap with no chemical pH-stabilizers, is not as gentle on the skin as most modern soaps unless it is aged for a long period of time. This is due to its free alkaline content mentioned earlier. However for the normal uses, and for normal skin types, a soap from a good manufacturer, which is aged for over eight months, will be of good quality by any standard.

Marseille soap or Savon de Marseille is a traditional soap made from vegetable oils that has been made around Marseille, France, for about 600 years, the first documented soapmaker in the area being recorded in about 1370.
 Traditionally, the soap is made by mixing sea water from the Mediterranean Sea, olive oil, and the alkaline chemicals soda ash (sodium carbonate) and lye (sodium hydroxide) together in a large cauldron (usually making about 8 tons). This mixture is then heated for several days, stirred constantly. The mixture is then allowed to sit and, once ready, it is poured into the mould, and allowed to set slightly. Whilst still soft, it is cut into bars and stamped, and left to completely harden. The whole process can take up to a month from the start before the soap is ready to use.
Source
Castile soap
Castile soap is a name used in English-speaking countries for olive oil based soap made in a style similar to that originating in the Castile region of Spain. CAstile soap is made olive oil with addition oа animal fat or synthetic substances.

Nabulsi soap is a type of castile soap produced only in Nablus in the West Bank, Palestine.[1] An olive oil-based soap, it is made up of three primary ingredients: virgin olive oil, water, and a sodium compound. Those who make the soap are proud of its unique smell, which they see as a sign of the quality and purity of its ingredients.

Aleppo soap is a vegetable oil soap that is similar to Marseille or Castile soap, but made in Aleppo, Syria.
The main constituents of Aleppo soap are olive oil and laurel Oil.

  The olive oil used is pressed from the left-overs of prior olive pressings, called "pomace" and is a green color because of the high amounts of chlorophyll (the organic compound which makes all plants green) in the pomace. This oil is used because it is cheap. Upon saponification, the olive oil loses many of its intrinsic qualities; however its high vitamin E content is thought to remain intact through to the finished product.
  Laurel oil is very expensive, and obtained, through various means, from most parts of the bay laurel tree. It is thought to have high antiseptic and antioxidative qualities. It also adds a nice scent to the soap.
 The sodium hydroxide used to affect saponification in the oils was formerly obtained from the "salsola kali" plant, which we would call a tumble weed. The plant was burned to obtain sodium carbonate in the ash, which upon a number of processes involving quick lime and water, is made into sodium hydroxide: a strong alkali.Currently, the sodium hydroxide used is obtained through various processes involving sodium chloride from sea salt.
 Aleppo Soap, being a handmade soap with no chemical pH-stabilizers, is not as gentle on the skin as most modern soaps unless it is aged for a long period of time. This is due to its free alkaline content mentioned earlier. However for the normal uses, and for normal skin types, a soap from a good manufacturer, which is aged for over eight months, will be of good quality by any standard.

Marseille soap or Savon de Marseille is a traditional soap made from vegetable oils that has been made around Marseille, France, for about 600 years, the first documented soapmaker in the area being recorded in about 1370.
 Traditionally, the soap is made by mixing sea water from the Mediterranean Sea, olive oil, and the alkaline chemicals soda ash (sodium carbonate) and lye (sodium hydroxide) together in a large cauldron (usually making about 8 tons). This mixture is then heated for several days, stirred constantly. The mixture is then allowed to sit and, once ready, it is poured into the mould, and allowed to set slightly. Whilst still soft, it is cut into bars and stamped, and left to completely harden. The whole process can take up to a month from the start before the soap is ready to use.
Source
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