What vessels are primarily used for aging Ruby-style ports?

The aging of Ruby-style ports typically occurs in large old oak casks or stainless steel tanks. This method is essential because Ruby ports are intended to maintain their vibrant fruit flavors and youthful character, which can be preserved better in larger vessels. Large casks have a smaller surface area-to-volume ratio, which minimizes the exchange of oxygen between the wine and the atmosphere, thereby reducing the oxidative aging that would otherwise occur in smaller barrels.

The use of stainless steel tanks also serves a similar purpose, as they are inert and prevent any influence from wood or oxygen, helping to retain the fresh, fruity essence of the wine. In contrast, smaller new oak barrels would impart more wood influence and oxidation, which is not desirable in Ruby ports. Concrete tanks and glass bottles are less common for aging Ruby ports, as they either do not provide the desired characteristics for maintaining the style's profile or are used for storage rather than aging. Thus, the combination of large old oak casks and stainless steel tanks is most suitable for achieving the intended style and quality of Ruby ports.