Black dog triple gold reserve is the only blended scotch whisky that is produced through a triple maturation process. This technique involves malt and grain whiskies separately aged in american bourbon barrels and subsequently blended and once again matured in oloroso sherry butts for an extended duration of time. This gives the blend a unique flavour coupled with a delicate finish. Conversely, in standard scotch, both single malt and grain whisky are matured together. During triple maturation, matured grain whisky and matured single malt are blended together and then aged again in sherry casks. This is the third and final step of maturation after which this whisky is bottled and sold. It�s manufactured by united spirits limited, a subsidiary of diageo plc.