I know someone who did a study on horses in a wild herd out west. He studied how often the horses rolled in the dirt. He found that light colored horses rolled MUCH more often than darker colored horses. His theory is that it is an effort to disguise themselves and to make then blend in more. Maybe the predators wouldn't see them as easily.
The horse in my avatar had a deep seated desire to be a chestnut. He rolled constantly in our red clay often giving him an interesting peach coloring.
Nothing you can do but wash wash wash.
This whole argument about semantics reminds me of the chestnut vs sorrel debate. Just leave it as a difference between national cultures, folks. There doesn't really have to be a winner here. As long as the actual DNA test is acknowledged, who care what they call it?
I still, and always will, call a "kimblewick" a kimberwicke.