The first soap like substance is said to have been first
used and produced in around 2,800 BCE in Ancient Babylon. The formula for this
soap included water, alkali and cassia oil and was found written on a
Babylonian clay tablet around 2,200 BCE.
Soap was widely known about and used in the Roman Empire. Early
Romans made soap in the first century A.D. from urine. The urine
contained ammonium carbonate which caused a reaction with the oils and fat in
wool which created the soap like substance.
After
the fall or the Roman Empire it was not until around the 8th century soap
making was revived. This occurred first in Italy and Spain and by the 13th
century France too. It was in the 14th century that soap making came to
England. Soaps produced in the south of Europe, Italy, Spain, and southern
France were made from olive oils. This made the soaps of a higher quality.
England and northern France did not have access to these oils and therefore
were forced to use animal fats.
How
to make soap
Oils:
24 ounces olive oil (not extra
virgin)
24 ounces coconut oil
38 ounces vegetable shortening
Alkaline
Solution:
12 ounces sodium hydroxide (lye).
32 ounces spring or distilled
water
Fragrance or Essential Oil
4 ounces of your favorite
fragrance
Equipment:
Safety Goggles
Rubber Gloves
Scale to weigh the ingredients
A one gallon stainless steel or
enamel kettle, not aluminum, and not lined with non-stick surface
Glass or plastic wide mouth
pitcher to hold water and lye
A two cup plastic or glass
measuring cup
Wooden spoons
Stainless steel wire whisk or a
hand blender
One accurate glass thermometer
that registers between 80-100 degrees F.
Plastic shoe box for your soap
mold. Spray with vegetable spray so soap will release easily.
2 towels to cover your soap
A source of running water, in
case of a spill.
You will need several hours of
time to make your soap.
- Weight out 12 ounces of lye (sodium hydroxide). Weigh 32 ounces of cold water in glass container.
- Slowly add lye to water, stirring gently. It is very important to add the Lye to the water and not the other way around, otherwise the reaction is too quick and it is dangerous. Make sure to stir with a wooden spoon, plastic will melt and metal will react.Set aside and allow the lye to cool.
- Weigh out 24 ounces of coconut oil and 38 ounces of vegetable oil shortening into the metal kettle. Porcelain coated metal, or glass vessels are fine, regular metal pans and pots are fine for melting the oil, but inappropriate for mixing lye solution with oil, or setting off lye/water mixture - use canning jars or heavy glass made for drastic temperature changes. Melt these oils over low heat and stir frequently. Remove from heat after oils have melted and add the 24 ounces of olive oil.
- When your lye has reached a range of 95-98 degrees Fahrenheit / (35-36 degrees Celsius) and your oils are at the same temperature, add the lye in a slow steady stream to the oils. Do not use metal implements to stir raw soap. This will cause a reaction again, use a wooden spoon. After about ten minutes you will notice a change in your mixture. This is called saponification. "Tracing" occurs when the spoon stirred through the mixture leaves a "trace" behind it.
- Add your fragrance when tracing occurs. The mixture will appear like thin cream, and droplets of soap will stand up on the surface. Stir well. Be ready to pour natural soap in your mold. Some fragrances and essential oils will cause soap to set quickly in your pot.
- Use an old plastic spatula to scrape out your soap-pot. Use gloves and eye protection. Raw soap is caustic and it can burn skin. Raw soap is strong enough to use as paint remover. Cover your shoe box with the two towels and set aside, and out of air drafts for eighteen hours. The soap will go through a gel stage and a heat process. At the end of this period uncover the soap and allow to sit for another 12 hours. If your soap has a deep oily film on top the natural soap cannot be used because it has separated.. This will occur if your measurements were not accurate, or if you did not stir long enough or if there is a drastic difference in lye solution temp vs. oil temps when mixed. Sometimes soap will not set at all, or will have white or clear pockets in it. This is caused by under-stirring during the soap-making process and the finished product is not only unusable, but caustic. Use care when disposing of this.
- Unmold your natural soap. Turn the box over and allow the soap to fall on a towel or clean surface. Cut your soap into bars.
It would be really interesting to take a science perspective on this - and ask a simple question - what do the different ingredients do in order to create the soap??? (You might need to explain what a soap is first). Not the simplest Q to ask, but def interesting.
ReplyDeleteThere is a wide variety of products that can be used when making soap. It is not possible to identify each one and each the effect it produces, but some bases that are used to make soap can be explored.
ReplyDeleteIn order for saponification to occur the right ingredients must be added and used. All soaps need a base ingredient often this is a substance known as lye (sodium hydroxide). Lye appears to make a hard solid bar of soap. Different oils can be used as the base ingredient and the variation in oils will cause different reactions and therefore different soap properties. Some examples of different acid bases include;
Palm oil;
Bubbly lather No
Creamy/Stable lather Yes
Cleansing Mild
Conditioning Some
Hardness Yes
Above is a list of properties of a soap made using palm oil. Palm oil has a glycering yield that is lower than the other oils often used to make soap. This is due to the high amount of fatty acids that are free. However even though the glycerine levels are lower the use of palm oil in soap making is favoured as it produces a ‘creamy/ stable lather’ and a hard soap.
Jojoba oil;
Bubbly lather No
Creamy/Stable lather Yes
Cleansing Mild
Conditioning Yes
Hardness No
There are two types of jojoba oil that can be used; refined jojoba oil and unrefined jojoba oil. The refined oil is odourless and clear, with the unrefined version being golden with a distinct smell. Both oils through do have long shelf lives which is a positive aspect of the soap produced with the oils. Often it can last between 2-4 years. A positive aspect of the jojoba oil is the benefits for the skin. The PH levels are similar to our natural sebum. As a result often jojoba is found in products that are left on the skin for a time e.g lotions and lip balms.
Avocado oil;
Bubbly lather No
Creamy/Stable lather Yes
Cleansing Mild
Conditioning Yes
Hardness No
Avocado oil is beneficial for the soap making process as it had a very high level of molecules that do not take place in saponification. This is a positive property as it means that the beneficial ingredients in the soap will not combine with the lye, meaning the soap will stay together throughout the soap making process. However avocado oil doesn’t produce a particularly hard bar. Therefore it is recommended that it is mixed with other oils such as coconut or palm oil.
Another ingredient that is later added to soap is often a natural preservative. A good natural preservative is said to be grapefruit seed extract. Not only does this improve the shelf life of the soap product but often this adds positive benefits to the soap, including adding
• A high content of vitamin C
• A high content of vitamin E
• A large amount of beneficial antioxidants
Lauren
Info found from
ReplyDelete14/4/2012
http://www.soap-making-resource.com/soap-making-ingredients.html