In Nicaraguan and Dominican practice, the fillerpriming that sits between seco and ligero: fuller than seco, more combustible than ligero, often glossy with oil. Cuban wrapper sorters historically used viso for oily, sheened leaves rather than for a priming.
Why it matters
Viso is the blender's bridge grade, adding body without the burn penalty that heavy ligero brings.
In context
"Dropping one ligero and adding two viso softened the blend without gutting it."