Just Speculating on a color that has been studied extensively on a domestic animal

The Champagne gene is a recently discovered dominant gene that has the ability to dilute both black and red pigment. Champagne has visual characteristics that differ from cream, pearl and dun dilutions. Some common characteristics of a champagne horse are: pink skin, dark freckles especially around the eyes and on the muzzle, a shiny coat that is often slightly darker in the winter and eye color that will go through a number of color changes starting blue and evolving to a hazel or amber color. It is possible for a horse to have several dilution genes in which a combination of the dilutive affect will be seen. Champagne dilution is caused by a dominant gene meaning a single copy of the gene will cause a visibly champagne horse. Unlike cream dilution, there are no visual differences between a horse with one copy or two copies of Champagne. A homozygous champagne horse will always pass one copy of the champagne gene to its foal. Heterozygous horses have a 50% chance of passing the gene on to its foals. Gold Champagne is a Chestnut or Sorrel horse plus champagne. Gold Champagne horses also vary in shade, and they appear distinctly different though due to the freckling as stated above. A bay horse plus champagne is referred to as Amber Champagne. Amber Champagne horses are often confused with buckskin or dun. One difference is that Amber Champagnes generally have brown or even hazel eyes.
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Posted by Wade G. Burck 31 Expert Commentary