Answer: Azulene
Have a look in your schoolyard and backyards, and see if you can find the Wild Flowers, Stones and/or Marine Life that contain Azulene (the chemical compound that would make them blue). Azulene is an organic compound, an isomer of naphthalene. Even though naphthalene itself has no color, azulene is dark blue, hence the dark color Blue in the essential oils of Yarrow, Blue Tansy, Blue Chamomile, Cypress and Black Spruce. It is not surprising that the Spanish word for Blue is Azul. The mushroom Lactarius indigo is blue because of a derivative of azulene. Azulene is also found in some marine invertebrates, and in Lapis Lazuli stones found in Middle Eastern Persia. http://en.wikipedia.org/wiki/Lapis_lazuli
The compound azulene has a long history, dating back to the 15th century as the azure-blue chromophore was first obtained through steam distillation of the German Chamomile flower. This azure-blue chromophore was later discovered in Wild Yarrow flowers and named in 1863 by Septimus Piesse. Its structure was first reported by Lavoslav Ruzicka in1937. With anti-inflammatory, skin healing properties, it is often in skincare products. http://en.wikipedia.org/wiki/Azulene
Even though Wild Yarrow flowers, Achillea millefolium, grow in colors of bright yellow, white, pink, orange, salmon and purple, the oil of the Yarrow flower is azure blue. Blue Yarrow oil is what is termed as volatile as it has “proazulenes”, making it blue.
www.essentialoils.co.za/essential-oils/yarrow.html
Yarrow oil is both a sweet and spicy smell, and is watery in its constitution. Yarrow is Sacred, Holy, Healing and Spiritually Protective for many First Nations Peoples. Thank you Mother Earth for these healing flowers, stones and marine life – and for Azulene and the color Blue!
Blue Tansy essential oil also is a vivid deep blue color due to its azulene content. http://en.wikipedia.org/wiki/Azulene. It is wildccrafted from common wildflowers grown in Morroco and North Africa from thee daisy family. The Latin name is Tanacetum Annuum. Health benefits include natural antihistamine and anti-inflammatory. Herbalist Peter Holmes says it as also a “qi” or energy regulator for the body.
www.Snowlotus.org/blue-tansy-essential-oil-article.aspx.