High Quality Content by WIKIPEDIA articles! Orange oil is an essential oil produced by cells inside the rind of an orange fruit. In contrast to most essential oils, it is extracted as a by-product of orange juice production by centrifugation, producing a cold-pressed oil. It is composed of mostly (greater than 90%) d-limonene, and is therefore often used in place of pure d-limonene, which can be further extracted from the oil by distillation.