Champagne Characteristics
There are a few characteristics exclusive to animals affected by champagne, which makes it one of the dilutions that can be visually identified with a reasonable degree of accuracy. It is one of the few dilution genes that affect the skin as well, making it a dusty pink color. They can also have faint dorsal stripes, but dark like a true dun. Otherwise the champagne coat is very uniform in color, with no obvious counter shading.

Metallic Sheen

Freckles

Light Eyes
Champagne Shades
The champagne gene affects the bases, along with some of the modifiers and dilutions to varying degrees. Any animal affected by the gene can carry a metallic sheen and reverse dappling in their coat.
Learn More About the Champagne Dilution
Be sure to check out a guest post with a more complex look at the champagne gene: Equine Champagne Gene