Authentic Nag Champa belongs to the Champa class of Indian incense, originating from the Champa flower. Champa incenses contain a natural ingredient indigenous to India called halmaddi, which is a semi-liquid resin taken from the Ailanthus Malabarica tree. It is what gives Nag Champa its characteristic grey color. Halmaddi is hygroscopic which means it absorbs moisture from the air. This can cause Nag Champa incenses to have a wet
feeling to them.