Testing essential oils at home helps ensure you are using safe and effective products. Start with the paper test: place one drop on blotting paper and let it evaporate. 100% pure essential oils should leave little to no greasy residue. Next, check the aroma—natural oils have complex, evolving scents, unlike flat synthetic smells. You can also perform a water test by adding a drop to w... https://www.pureoilsindia.com/blog/top-20-essential-oil-brands-in-the-usa