The use of hand-painted cocoa butter and glossy finishes became a hallmark of the gourmet category.
If you are looking for a specific paper, I can narrow the search if you tell me:
Dark chocolate: An overview of its biological activity ... - PMC
Chocolatiers focused on educating consumers that "real chocolate" is distinct from high-sugar candy, emphasizing smaller portions with higher flavor intensity.
Was the paper about (e.g., tempering, shelf life)? Was it about marketing/consumer behavior ?
Do you remember a specific mentioned (e.g., "sea salt," "astaxanthin," or "cinnamon")?
Research published in 2017 focused heavily on the and nutrient retention of dark chocolate products:
Academic reviews confirmed that dark chocolate contains bioactive components (flavonoids, vitamins, and minerals) that positively modulate the human immune system.