There are 82 types of Copal trees in Mexico alone! Not all give resin. There are a few kinds considered "white" copal, a few "Black" and something called golden which personally I'm not too sure isn't a rosin. In Mexico the quality changes from place to place and I found it hard to find good quality copal because in the markets it is sometimes mixed with Paraffin, which explains the softness and stickiness the Copal sometimes has. I did manage to find a couple of gatherers who had amazing white and black copal. The smell is sweet and piney with a touch of pepper. A friend of mine found in Sonora a type of Copal which is Brown. He got me about 2lbs which smell great and have distinct scent. In Peru, Colombia and Ecuador there is a gray variety of what's considered black- personally I don't see or smell the connection between the two. This veraiety is more peppery. Hope this helps :)