Yellow Spot Irish Whiskey is aged for 12 years. Yellow Spot got its name from Mitchell's practice of marking their aged casks of whiskey with a mark or splotch of paint to determine the age of the whiskey. Yellow Spot Irish Whiskey is a single pot still Irish Whiskey that has been matured in three different types of casks: American Bourbon cask, Spanish Sherry butts, and Spanish Malaga casks for a sweet taste and flavor.