Frankincense vs Copal on the Burner

Frankincense and copal are both fragrant tree resins burned as incense, but they come from unrelated plant families and read very differently on charcoal. Frankincense is the dried oleo-gum-resin of Boswellia trees—chiefly Boswellia sacra, Boswellia carterii and Boswellia papyrifera—tapped in Oman, Yemen, Somalia and Ethiopia; its smoke is drier and more citrus-and-pine in the first minutes, then settles into a balsamic, slightly green base built on incensole acetate and boswellic acids. Copal is resin from several Bursera and Protium species native to Mexico and Central America, historically the ceremonial resin of Olmec, Maya and Aztec ritual; it burns lighter and sweeter, closer to pine sap and citrus peel, with less of frankincense’s resinous weight. On a censer side by side, frankincense reads as the older, heavier, more incense-like of the two; copal reads brighter, fresher and more transparent.

What is frankincense, and what is copal?

Frankincense, or olibanum, is harvested by cutting the bark of Boswellia trees and letting the exuded resin harden into tears over several weeks. The main commercial species are Boswellia sacra (Oman, Yemen), Boswellia carterii and Boswellia papyrifera (Somalia, Ethiopia, Sudan) and Boswellia frereana, prized for its softer, more citrus-forward tears. Grading runs from pale, near-white “hojari” tears to darker, more resinous grades, with color and clarity tracking purity and harvest conditions rather than species alone.

Copal is a broader trade name than frankincense. In practice it covers resin from Bursera bipinnata and Bursera copallifera in Mexico, from Protium copal in Guatemala and Belize, and sometimes from unrelated trees like Hymenaea courbaril. Mesoamerican cultures distinguished white, black and gold copal by tree source, age and processing, a system still used by copaleros today. Because “copal” names several unrelated species rather than one genus, its scent varies more between batches than frankincense does.

What does frankincense smell like on charcoal?

Fresh frankincense opens with a bright, almost sharp lift from monoterpenes—α-pinene, limonene and smaller amounts of α-thujene—giving the first minute of smoke a pine-and-citrus edge. As the tear heats through, that top note gives way to a rounder, warmer body driven by incensole acetate and diterpene boswellic acids, which read as balsamic, faintly waxy and slightly green rather than sweet. Good hojari-grade tears keep this progression clean; darker, older resin tends to smell heavier and more resinous from the first minute, with less of the initial lift.

What does copal smell like on charcoal?

Copal shares the same opening monoterpenes as frankincense—α-pinene and limonene are common to most conifer- and Bursera-derived resins—so the first impression can be similar: bright, piney, slightly citrus. Where copal usually diverges is in what follows. Instead of settling into a heavy balsamic base, most copal grades stay comparatively light and clean, closer to fresh pine sap, sometimes with a faint honeyed or slightly floral edge depending on species and age. Black copal, which has oxidized and darkened over months or years, smells noticeably deeper and more resinous than fresh white copal, closing some of the gap with frankincense.

Botany and chemistry side by side

The two resins are not chemical cousins so much as parallel solutions to the same problem: a tree sealing a wound with a mix of volatile terpenes and non-volatile resin acids. Frankincense’s non-volatile fraction leans on boswellic acids, a class largely absent from copal. Copal’s resin acids vary by source tree and are less standardized in the literature, which is part of why “copal” tolerates more scent variation than “frankincense” does under a single name.

History and ritual use

Frankincense’s trade history runs from ancient Egypt and the Arabian incense routes through the Jewish Temple’s incense offerings to its enduring role in Catholic and Orthodox liturgy and the Ethiopian coffee ceremony, where a few tears are burned on charcoal between rounds of coffee. That continuity across three millennia is part of why frankincense smoke reads, to many noses, as “what incense smells like.”

Copal’s history is just as old but geographically distinct: it was burned in Olmec, Maya, Zapotec and later Aztec ceremonies, offered to deities and burned at burial sites well before European contact. That ritual role continues in Mesoamerican incense practice today, most visibly in Day of the Dead altars and in limpias, cleansing rituals where copal smoke is fanned over a person or space. Frankincense entered global trade networks earlier and more widely; copal remained comparatively regional until recent decades, when it became easier to buy outside Mexico and Central America.

Burning technique: what changes on the coal

Both resins are usually burned the same way, in small tears placed on a lit charcoal disc rather than directly on flame; the burning technique matters more than the resin for how clean the smoke reads. Frankincense tolerates slightly hotter coals without turning acrid, because its resin acids scorch less readily than raw sugars would. Copal, especially paler and softer grades, scorches faster and can turn sharp or plasticky if the coal is too hot or the tear too large; smaller pieces on a coal that has cooled slightly after its first flare tend to give a cleaner result.

Neither resin needs much per session. A single small tear of either, roughly the size of a pea, is enough to scent a room; larger amounts mainly add smoke density rather than more character.

Choosing between them

For a heavier, more traditionally “church incense” mood, frankincense is the more reliable choice, and its scent profile is more consistent from batch to batch because it comes from a narrower group of species. For a brighter, sweeter, more transparent smoke—or for anyone assembling a Day of the Dead altar or exploring Mesoamerican incense traditions on their own terms—copal is the better fit, with the understanding that scent will vary more depending on which tree and grade you buy. Buying both and burning a tear of each on separate coals, side by side, is the fastest way to hear the difference the descriptions above are trying to put into words.

• frankincense
• copal
• incense
• resin
• boswellia