Most varieties on the rum market are blends. Blended rum is a blend of several original rums and requires the skill of a master blender.
The matured rum is far from being what the consumer will later find in the bottle. The task of the master blender is to blend the rum from the various barrels in such a way that the final result corresponds exactly to the desired taste. The challenge here is that each barrel has its own individual flavor characteristics and requires a great deal of feeling and experience on the part of the master blender. The blender's sure instinct is also required for the creation of new rums.
The counterpart to the blends are the so-called single casks. A single cask rum comes from a single barrel and is bottled without further blending. With these rarities, the master blender thus does not have his hands in the game. What the rum connoisseur finds here is a specialty whose taste goes to the account of nature.
One special blending method, for example, is the so-called solera process. Here, young rums are stored above older ones and also blended with them. The final product is taken from the soleras, the wooden barrels stored at the very bottom. The age here depends on the youngest share of the assemblage. The result is a unique blend of blended rums from rums of any age.
A more detailed description of rum production and categorization can also be found in the rum category.