Amari range across three bitterness bands: Light (Aperol, Cappelletti) — aperitivo. Medium (Campari, Cynar, Nonino) — Negroni, Boulevardier, Paper Plane. Heavy (Fernet-Branca, Averna, Amaro Lucano) — digestif. Sweetness varies independently. Know the band: never sub a light for a heavy in a Boulevardier.