Consisting of green-bloods that traditionally protect, deflect & exorcise (one in particular which has been used for a millennium to protect magicians) + the unparalleled S. is for Samael anointment, BCD works like a fortifying charm.
Caravan products have always consisted of The Pure Unadulterated Thing/s & they always will, no matter what it takes to procure these ingredients. This is one reason why Clients find them so effective. The scents are bracing; the results are extraordinarily palpable. (This is also one reason why Caravan prices are higher than those garden variety corner "occult" stores.)
Black Circle Dust (& its coming-soon sister products Red Circle Dust™ & Purple Circle Dust™) can also be burned as an incenses/suffumigates, but note that they contain a smaller amount of the correspondence allies, simply because they must be mixed with the corresponding dust. Because of this, you'll find the scents, in situ or when burned, are far more subtle than what we're used to at The Caravan. But burning is not their raison d'etre. Dusting is. Personally, the Sorceress doesn't burn them & doesn't highly recommend it, but one could in a pinch.
The Sorceress shares this favourite technique: Lay a good circle of the dust, sprinkle with Fire of Hekate or Water of Fire. Light. (DO NOT do this unless you're in a completely fireproof location, have a fire extinguisher on hand, are familiar with fire ceremonies & are an experienced fire practitioner.)
Keep out of reach of children, like all Caravan products & note that this is not a body dust.