How to Determine the Quality of Vegetable Oil: 5 Home Ways

You can determine the quality of sunflower oil with a simple home test. Vegetable oil is often counterfeited or impurities are added to make it cheaper. You can check the quality of the oil at home.

How you can check the quality of your oil with salt

Dissolve a teaspoon of salt without any salt in 50 ml of your oil. Mix it up. If the oil is of high quality and clean – the salt must not dissolve. If the salt has at least partially dissolved, there is excess water in the oil.

Check with iodine

Pour an incomplete glass of oil and drop one drop of iodine. The drop of iodine should retain its shape and remain on the surface for a long time. If it spreads or goes straight to the bottom, the product is not made properly and has harmful impurities.

Determining Oil Quality with a Tissue

Pour a little oil into the bottom of a glass. Place a napkin over the glass and turn it upside down for a moment. A round oil mark will appear on the napkin. If it stays round, the product is good, but if it spreads out beyond the circle – the oil has been diluted with water.

How to check the freshness of unrefined oil by hand

This is how you check unrefined oil. Put a little oil on the back of your hand. If it spreads out easily, it’s fresh. If it thickens and doesn’t drip, then the oil is rancid and must not be used.

How to Test Oil Quality Before Buying

You can already check the quality of the vegetable oil in the store before you buy it. Turn the oil bottle upside down and shake it slightly. If small bubbles appear in the oil, you can buy it. If it remains thick and homogeneous, it is probably spoiled. If you buy it by weight, smell the oil – fresh product should have a distinct aroma of seeds.

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Written by Emma Miller

I am a registered dietitian nutritionist and own a private nutrition practice, where I provide one-on-one nutritional counseling to patients. I specialize in chronic disease prevention/ management, vegan/ vegetarian nutrition, pre-natal/ postpartum nutrition, wellness coaching, medical nutrition therapy, and weight management.

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