Methods of extraction

CO2 extraction (carbon dioxide) is more efficient in the separation of waxes and other more solid lipids. But a CO2 extract is very dark and can stain the skin. They are extracted using CO2 (carbon dioxide) gas under pressure at ambient temperature. CO2 extracts are primarily used by the food, body care, and herbal industries, yet CO2 extracts are also excellent for aromatherapy and natural perfumery.

Hydrosol is a steam distilling with water and can be made with the whole plant.The collected oil is officially an “essential oil”, and the remaining water is sold as a “hydrosol”.

Infused Oil is the process of extracting chemical compounds or flavors from plant material in a solvent such as water, oil or alcohol. There is warm and cold infusion. Heat infusion is best used on barks, roots, and berries, while Cold infusion is used for the delicate leaves, flowers and aerial parts to the plant.
Infused in cold pressed oils is an excellent way to utilize all of the powerful healing properties.

Steam Distilled produces the purest form and has a Therapeutic grade Essential Oil (commonly used as fragrances, flavorings and in aromatherapy).

Cold-Pressing method involves the simple pressing of the rind at about 120 degrees F to extract the oil. The oil released is separated from the pulpy water and collected as an essential oil. Because pesticides are sprayed right onto the rinds, it’s important to seek organic options for cold-pressed essential oils.

Solvent Extraction (crude oil) is typically labeled as “absolutes” and is the process of using solvents like hexane and alcohol to separate compounds. Sometimes there is a significant amount of solvent left behind in the absolute, resulting in a less-pleasant aroma and lesser-quality end product.

Fractionating is a process that involves heating the oil, then cooling it quickly so that it breaks up into fractions. Fractionated oil is less desirable than organic.

Refined: Some oils undergo a refinement process in order to remove impurities, improve the color or texture, or stabilize the shelf life of the oil. The oil is then centrifuged and washed with water until the pure oil remains. The oil may also be degummed to remove the sticky phospholipids, color pigments and odor lending portions

Bleached: Some lipids are bleached in order to improve the color and clarity of the oil. Bleaching is generally done by passing the oil through fuller’s earth or clay and then filtering the oil.

Deodorized: Some lipids undergo a deodorization process in order to remove compounds that lend an unappealing or overpowering aroma to the oil. This process is made more effective by heating the oil to high temperatures and performing this process under a vacuum to help remove all of the volatile odorous substances. Due to the high temperatures used, deodorization is clearly the most damaging process of refinement

The entire plant can be used to make an Extract.
It can be extracted into alcohol, glycerin or water, while an infusion is done with oil. Plus you can use dry or fresh plants for your extract.
The best extraction technique is to use cold pressed vegetable oil with all the beneficial ingredients.

How to make your own Extract ;
http://www.healthynewage.com/making-herbal-tinctures.htm

http://coopbewell.blogspot.com/2013/05/making-herbal-oils-creams-salves.html

 https://theherbarium.wordpress.com/2009/02/01/tinctures-fluid-extracts/