Calendula oil is a combination of a base oil, which is usually olive oil, but can be soybean or other good quality oil, and the dried petals of Calendula officinalis. This is also known as pot marigolds, or edible marigolds. These flowers are bright yellow or orange, and the blossoms are used to make a herbal concoction that is great for dry skin. Place the petals in a jar and cover with oil, closing tightly and set in a sunny window until it turns a nice shade of orange or yellow. This may take a few days, so shake the jar once or twice a day to keep it mixed. Once it is ready, use a cheesecloth to carefully separate the petals from the oil.
One of the spaces that are most affected by negative ions are your office spaces. These are also the places which get most stuffy as there is very little airflow during the day or night, except from the air conditioner. To solve this problem it would be a great idea to use diffusing essential oils. This way you can restore the freshness and balance.