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Shelf life of a fixed oil

Shelf Life of a Fixed OilWe are regularly asked about the shelf life of a fixed oil (you know, the animal and vegetable oils we use for soap making). There are a few things we would like to address for storage.

To have the freshest material I would like you to use up any oil you purchase from us within 1 year from the date of purchase.

To get the longest life you should store your oils in a dark, cool, dry place. Dark because UV rays break down the oils. Cool because microbial activity, including oxygen exchanges, happen slower at cooler temperatures. Dry because moisture encourages growth of yeast, bacteria, and mold which can contaminate the oil by either growth inside the oil if water is introduced or by odor from growing populations of these organisms.

In the event you live in a very moist and warm climate I would recommend refrigeration, including freezing. The one reason I hesitate to mention refrigeration to most people is they do not have a dedicated refrigerator for low odor vegetable oils. There is nothing like an oil that was stored in a refrigerator next to a cut onion. Your soaps and lotions will have an onion odor that can not be removed.

Freezing will not harm a fixed oil. Liquid oils may congeal but they will melt when warmed to room temperature and it takes nothing more than removing the oil from the freezer and setting it on the counter. Zero energy melting of a congealed oil! There are some oils (waxes) that really have a long shelf life and I rarely worry about their stability. These are beeswax, jojoba oil and lanolin. If you plan for the 1 year rule and treat your oils with care, you will have a fine time making soaps and lotions!


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