Dried herbs should be stored away from sunlight because sunlight degrades their essential oils, which are responsible for their flavor and aroma, leading to a loss of potency.
Dried herbs contain volatile oils that give them their characteristic flavor and scent. These oils are sensitive to light, especially ultraviolet (UV) rays present in sunlight. When exposed to sunlight, these oils undergo a process called photodegradation. This means the light's energy breaks down the chemical compounds in the oils, causing them to evaporate or change composition. As a result, the herbs lose their flavor, aroma, and overall potency. Storing dried herbs in dark containers and away from direct sunlight helps to preserve these essential oils, ensuring that the herbs retain their quality for a longer period. Think of it like this: sunlight is like a tiny thief, stealing the flavor right out of your herbs.
To maximize the shelf life of your dried herbs, store them in airtight containers made of dark glass or opaque plastic in a cool, dark, and dry place, such as a pantry or cupboard away from the stove. Avoid storing them above the stove, as the heat and humidity can also degrade their quality.