Essential oils should always be kept protected from light in what kind of bottles?

• A. Clear glass bottles
• B. Brown or blue glass bottles
• C. Plastic bottles
• D. Aluminum bottles

Answer: (B)

Light exposure can trigger photochemical reactions in essential oils, leading to oxidation, loss of fragrance, and reduced potency. Storing oils in bottles that block or greatly reduce light helps preserve their chemical integrity and shelf life. Dark glass bottles, like brown or blue, filter out much of the light (including UV), making them the most effective practical choice for protecting essential oils from light damage. Clear glass would let light penetrate and accelerate degradation. Plastic bottles can allow light through and may interact with the oils, risking contamination or leaching. Aluminum would block light, but it’s not commonly used for essential oils due to compatibility and practicality concerns, so brown or blue glass remains the standard protective option.