Long time, so see we could say. 😀 This is why I’m presenting you an interesting topic for all crafters and users of homemade skin care products. We will talk about the difference between cold and hot pressed oil. Since this topic is broad, we will tell you more about cold pressed and cold extracted oils in the next article (next week). 🙂
Cold pressed oils are pressed under low temperatures (below 49° C / 120° F) and the seeds are not roasted. Such oils are higher quality than hot pressed oils but are produced in lower quantities. There is some oxygen present during the pressing, so oils oxidize faster than hot pressed oils (become rancid). Some very delicate cold pressed oils retain the best quality only for a few days!
The seeds are dropped inside a cylinder that contains a rotating screw. This screw grinds and crushes the seeds until the oil is extracted. Small holes in the bottom of the cylinder allow the oil to escape into a collection container. Although some heat is generated through friction as the screw breaks down the seeds, it’s usually not enough heat to damage the oil. – Livestrong
Cold pressed oils are best for direct application, such as in massage oil rather than in recipes that require heating. This would cause it to loose all its properties. It’s also great for cooking at low temperature.
Hot pressed oils are pressed at higher temperatures (higher than 49° C / 120° F), depending on the type of seeds. Hot process yields more oil from the material, so it’s best for seeds with lower oil content, such as sesame oil.
Electric heaters can be attached to the press cylinder; as the seeds inside the cylinder heat up, they become softer and break down more easily. Although this method tends to generate higher quantities of oil, the heat can reduce the flavor, aroma and nutritional content of the oil. – Livestrong
Main differences are:
a) Acid value: lower in cold pressed. These oils do not need to be refined.
b) Color: cold pressed oils have darker color. Refining helps make it lighter.
c) Nutritional value: cold pressed oils are more nutrient dense, retain active substances and retain the flavor. Cold pressed oil are believed to contain more antioxidants than fight free radicals, meaning they help prevent aging effects on our body.
d) Taste: Some seeds are better tasting when pressed at higher temperatures, such as sesame and peanut oil. These oils have better flavor, fragrance and color when pressed with higher temperatures. Hot pressed oils have a clearer taste but cotain less vitamins and sterols.
Types of pressing
Hydraulic oil press is popular for cold pressed oils because it doesn’t damage linoleic acid tissue and retains all nutrients in oil. These presses are flexible and efficient and can be used at home. Some presses press seeds in less than 15 minutes, which means they are very energy efficient.
Hydraulic oil press is mainly used for sesame seeds, but also for peanuts, flaxseed, rapeseed, sunflower seeds, soybeans etc. The press has a high oil yield, meaning you get more oil than from older presses with the same amount of seeds/material.
Here is a video demonstration on how to use a hydraulic oil press at home:
Screw oil press is used for hot pressed oils. You can use medium and small grains, such as rapeseed, cotton seed, peanuts and sesame seeds. Their working principle is pressing in the pressing chamber with a gradual strong pressure, so the oil can be squeezed out of all oil material. The friction generated higher temperatures than the hydraulic press.
How to cold-press:
a) use dry ingredients: oil materials should not have more than 10% humidity because water prevents optimum results. Dry the materials in oven before pressing.
b) let the oil sit for a few minutes: after pressing oil will have some foam on the surface. It will get clear in a few minutes (depends on the pressing machine).
c) store in tinted bottles: cold pressed oils are more prone to rancidity, so store them in colder rooms (below 20°C) and in darkness. Tinted bottles help as well.
Recipes with cold pressed oils:
Now that we’ve seen how to make cold pressed oil, it’s time to make some DIY recipes with it. We’ll use almond oil that has some amazing properties for our skin (check them here). 🙂
Quick face scrub with almond oil
- 1 tablespoon cold pressed almond oil
- 1 teaspoon sea salt
Combine and massage. Rinse with warm water.
Honey & almond face mask
- 3 tablespoons milk of your choice
- 1/2 tablespoon cold pressed almond oil
- 1/2 tablespoon ground almonds
Combine and massage for a few minutes. Rinse with warm water.
Next week we’re continuing with cosmetic basics: We will talk about cold pressed vs cold extracted oils.