Spirits and liqueurs require negatively charged caramel colours for alcohol stability.
To illustrate, a Class Four Caramel Colour in 80% alcohol will develop temporary haze. When adjusted to a lower alcohol concentration, such as 40% alcohol, the Class Four Caramel Colour will go back into solution. When high alcohol solubility is required for an application, a quality Class One or "Plain" Caramel Colour such as DDW 570 is stable in 80% alcohol. For some spirit applications, DDW offers caramelized fruits and other natural flavors.
In Europe, a food company can label Class One Caramel Colour as "Burnt Sugar" if the function is flavour and not colour.