Orris Root (or the root of the Iris) is one of our favorites here in the FSW studio, and is even featured in a new companion solid perfume, MIMOSA + IRIS.
"After an initial drying period, which can take five years or more depending on the use, the root is ground. It is then dissolved in water and then distilled. It becomes a highly scented, yellow-brown crystalline form. One ton of iris root produces two kilos of essential oil, also referred to as 'orris root butter' or 'butter of iris', making it a highly prized substance. Its fragrance has been described as tenaciously flowery, heavy and woody (paraphrasing Pavia, Dutch translation, page 40). It is similar to violets."