Pour carrier oil over to cover the flowers and cap the jar with a lid.
Let the oil infuse in a cool place out of direct sunlight for at least two weeks, or until the infusion is a golden color and ready to use.
Dehydrator method
Follow the first two instructions, and then place the jar into a box-style dehydrator (such as Excalibur brand). Set it to 100° F (38° C) and let it heat infuse for 24-48 hours.
Notes
The amounts of dried calendula flowers and carrier oils are estimates and don't need to be exact. You can make as much or as little of this infused oil as you like, so feel free to modify the amount. As long as the oil is covering whatever amount of dried flowers you decide to use, that is what matters!
For most skin applications I like to use a blend of coconut, sweet almond, and olive oils. Other options include jojoba, avocado, and sunflower. The kind of oil that you use will depend on the final application and your own personal preference.