What is the difference between red label and blue whiskey?

There's no such thing as "blue whiskey" in the traditional sense. It's possible you're thinking of a specific brand or product.

Here's why:

* "Red Label" is typically a descriptor used for a specific product line or brand. For instance, Johnnie Walker Red Label is a well-known blended Scotch whisky.

* "Blue" can be associated with specific brands or cocktails, but not a standard whiskey type. For example, "Blue Label" is a high-end expression of Johnnie Walker Scotch.

If you can provide more context about what you're thinking of, I can help you better understand the difference.