What characteristic do fresh hop pellets possess when healthy?

The characteristic that fresh hop pellets possess when healthy is a bright green appearance. This vibrant green color indicates that the hops are fresh and have retained their essential oils and other compounds that contribute to their flavor and aromatic properties. Fresh hop pellets are made from hops that have been processed shortly after harvest to preserve these qualities, and the brightness of their color reflects their vitality and freshness.

A bright green appearance is a clear indicator of the quality of the hops, as it suggests that the pelletization process was done correctly and that the hops have not oxidized or degraded. In the context of brewing, using high-quality, brightly colored fresh hop pellets can significantly enhance the flavor and aroma profile of the beer, contributing to a more expressive hop character.