Chamazulene is a sesquiterpene, derived from azulene, and found in German chamomile, giving it a blue color. It is also found in wormwood, yarrow, tansy, cypress, and blue violet.
Sesquiterpenes are less volatile than monoterpenes, but still prone to oxidation. They have a strong odor. If oxidized (exposed to air) they could cause skin irritation and/or mucous membrane irritation.
Compiled by: Kathy Sadowski