Vermouth styles: Sweet (Carpano Antica — house Manhattan/Negroni standard, Punt e Mes — pricier, more bitter). Dry (Dolin Dry, Noilly Prat — Martini standard). Blanco (Dolin Blanc) — slightly sweet, complex. Vermouth is wine-based and goes bad — bottles open get refrigerated, used within 30 days. A bad Martini is often a bad vermouth, not a bad gin.