Bursera copallifera is a Mexican dry-forest species closely associated with copal production in Oaxaca and the wider Mixteca. This darker resin is known as Copal Negro.
The word copal comes from the Nahuatl copalli, a term for aromatic resin burned as incense. Copal has held an important place in Mexican ceremonial life for centuries and remains especially visible in Oaxaca during Día de Muertos, the Day of the Dead.
This resin follows a distinctive natural-injury harvest. Instead of cutting the bark to trigger fresh resin flow, harvesters seek trees already damaged by fallen branches, animals or insects. The resin remains at the wound site for months while it hardens, darkens and the tree seals the damaged area.
The darkened resin is collected on Día de Muertos, the Day of the Dead, making the timing of the harvest part of the identity of Copal Negro itself.