Which container color is recommended to protect essential oils from light?

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

Answer: (A)

Light can degrade essential oils through photochemical reactions and oxidation, reducing potency and altering scent. To protect them, store in containers that block or minimize light. Dark-colored glass such as brown (amber) or cobalt blue filters out much of the UV and visible light that would reach the oil, helping preserve quality over time. Clear glass lets light through and speeds degradation. Plastic can interact with oils, potentially leaching chemicals or absorbing fragrances, and may not provide an airtight seal. Metal tins can block light but may react with the oils or impart taste or odor and aren’t ideal for long-term storage. So brown or blue glass bottles are the recommended choice to protect essential oils from light.