Oh okay, sorry, I thought you were. And I am, but it's not just this whole convo causing it.
And I asked people what they thought about bay dun on a Kiger site, this is what was said
"There is a sooty gene, also called counter-shading, that puts back black into the coat. It's not understood really well but on some horses its like a darker blanket thrown over them, falling on the top surfaces of the horse. Think of a sooty buckskin. Sometimes it is all over evenly. Think of a dark chestnut or dark palomino. Since it is a separate gene it can occur with other genes, like the dun gene. Some experts say that if you don't have a light coat color it "can't" be dun. But a dun and a sooty gene cause a darker color, usually all over the horse. So if the horse has an eel stripe (a hard line dorsal) it is dun, regarless of coat color. The challenge is that the sooty gene also makes a dorsal, but it has fuzzy edges. When you have a horse that is so dark that you can't tell whether the dorsal is sharp or fuzzy you really can't say for sure that it is dun, but if it has other markings, like leg barring, ear barring or light hair inside the ears - it is likely dun. So a bay dun has a hard edged dorsal and a darker coat color."