Yara Yara (2-Methoxynaphthalene) is a traditional name associated with Blue Yarrow essential oil derived from Achillea millefolium. Known for its deep blue color and herbaceous-floral aroma, it is used in niche perfumery and aromatherapy. Also known as Achillea oil and Blue yarrow oil by speciality chemical suppliers and manufacturers, it is appreciated for its calming and grounding olfactory profile.