Aged rums often represent the finest examples of mature rums from a distillery, often blended to achieve complexity and distinctive flavor profiles. The cost of storage and the loss of some rum from the barrels through evaporation adds to the cost of producing aged rums
White rum is clear, usually has a milder flavor and a lighter body than gold or dark rums. These light types of rum are most often used to create cocktails that do not have a need for bold rum flavor.
Flavored and Spiced Rum
The myriad types of flavors and spices infused into rums offer a wide range of interesting and multifarious variations of spirits, both full proof, and limited potency liqueurs and creams. Spiced and flavored types of rum offer unique flavors to cocktails, rum cakes, holiday libations, and many other uses, bringing decidedly tropical flavors to the palate.
As rum mellows in barrels over time, it takes on amber or golden hues. These golden types of rum usually present a more flavorful profile than the white or clear rums. Gold rums are used to make cocktails in which a stronger flavor is desired. Gold rums are often aged several years or more and some coloring may be added to provide consistency. Subtle flavors of vanilla, almond, citrus, caramel, or coconut may be present from the type of barrels used in the aging process.
Many aged rums are referred to as dark, only to distinguish them from light. The label of dark rum is often assigned to a range of rums that are not clear, from light golden amber to black, as well as rums that are well-aged. Source: Robsrum