Hemp oil ?

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Zany_in_CO

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I love hemp seed oil. I have some in the fridge that's 9 month's old, perfectly fine and not a sign of degrading. I use it to make LS and salve for a friend with psoriasis. When I bought it, I was told that it has a shelf life of 1 year. Now I just learned that it's prone to rancidity, but I'm wondering if ...

(1) Adding antioxidants like vitamin E and ROE might prevent it from going rancid?
(2) Once soaped, using a balanced formula and SoapCalc default numbers, wouldn't that stop it from degrading?

What is the shelf life of hemp oil

The short answer is, if stored correctly, an unopened bottle of our hemp oil will last 14 months from the date of production. The long answer is there are several factors that can influence the shelf life of hemp oil. The major ones are how the seed is pressed, how the oil is packaged and how the oil is stored. Read on...

http://www.hempoil.ca/shelf-life-of-hemp-oil/
I'd love to hear stories about your experiences with hemp oil going rancid in soap.

TIA
 

WeaversPort

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In for the learning.

So far I've been told Soybean and Rice Bran can have issues with going rancid, but I don't have any direct experience yet..
 

kchaystack

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If you look at the oil profile on a soap calculator:

http://soapee.com/oils/50

You will see that the linoleic and linolenic fatty acids are over 70% of the oil. These fatty acids will go rancid faster than the other soap making oils so soaps with high amounts of these fatty acids are more likely to develop DOS. We have discussed this on the board quite a bit. Most of us try and keep these 2 fatty acid numbers under 15 or 20.

All oils go rancid of course. ANd this is not the only factor in preventing DOS. But it is an important one.
 

Zany_in_CO

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If you look at the oil profile on a soap calculator:

http://soapee.com/oils/50

You will see that the linoleic and linolenic fatty acids are over 70% of the oil. These fatty acids will go rancid faster than the other soap making oils so soaps with high amounts of these fatty acids are more likely to develop DOS. We have discussed this on the board quite a bit. Most of us try and keep these 2 fatty acid numbers under 15 or 20.

All oils go rancid of course. ANd this is not the only factor in preventing DOS. But it is an important one.
Thank you, K. I checked that link and got these numbers:
http://soapee.com/oils/50

FATTY ACIDS
Linolenic 21%
Oleic 12%
Palmitic 6%
Stearic 2%
Saturated: 8%
Mono-unsaturated: 12%
Poly-unsaturated: 57%
Saturation Ratio 8 : 92

PROPERTIES
Bubbly 0%
Cleansing 0%
Condition 90%
Hardness 8%
Longevity 8%
Stable 8%

I then went to SoapCalc (my fave) and the numbers were identical to Soapee, with the addition of iodine and INS:

http://soapcalc.net/calc/SoapCalcWP.asp
Iodine 165
INS 39

You will see that the linoleic and linolenic fatty acids are over 70% of the oil.
What I see is that the linolenic is 21% of the oil. What am I missing?
 

Zany_in_CO

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I add roe to my hemp oil and have never had it go rancid keeping it refrigerated. I also have never had dos with a soap using hemp at 15%. I just check a bar with hemp oil that is 3 yrs old. No dos
Thanks, Carolyn! I appreciate the input.
 
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