White copal is the finest resin you will ever try. One grain changes the frequency in space. I use it at the beginning of the class to invite the good spirit and also at the end as a thank  for the good medicine that given to people. The tree secretes it like a scab from a wound. Antiseptic. Multi-layered purifier. It has a high frequency and it sounds the space and makes it sparkling. I feel that the good spirit and the forces of light and the elements are magnetized when white copal burns in space, giving food to the gods and inviting them to eat, they say in the Indian way that the people's proces is food for the forces of light.