When she was born she was a buckskin. I have a picture but I can just tell you she was a buckskin. Sire is a friesian, so literally jet black. I do beleive from you guy's description that the dam is a smokey black.
If she was a buckskin at birth she is a buckskin now. Shades may change but the colors/genetics don't. Sometimes there are little details that show what color she truly is which is why we want pictures :)
I'm still leaning toward the mare being a smokey brown rather than black based on what I'm hearing. I definitely see some sort of cream on that foal. I don't believe sooty usually shows that early on foals, I may be wrong but I'm fairly confident that it doesn't show until they get a bit older.
And to the above poster, just because a horse 'looks' one color doesn't necessarily mean it is, genetics can do some crazy things! I've seen horses that from looking at them looked BLACK but they tested to be sorrel, and even one that turned out being palomino! That being said unless the foal was color tested to be buckskin there is no way to prove that just because she LOOKED buckskin at birth that she was actually buckskin.
With that being said I'm still leaning toward both the mare and foal being smokey brown, or 'brownskin' as it is also called. I'm a little rusty on color and genetics, so I can't recall if a brown can have a bay. They're both agouti, just different forms of it. According to a few sites I poked around they can, in which case the foal COULD be buckskin (I'm still leaning toward smokey brown though) but again I'm not sure if the sites are even correct.
That foal is not a dun and if that's the **** in the background, there is no way she's a grulla. But there is a chance she's a smoky brown, just extremely dark, which wouldn't be entirely out of the ordinary based on how many browns are alsmost completely black.
If the sire is purebred Friesian then it's extremely likely that he's homozygous black, no cream, so any agouti or cream must have come from the dam.
I was wondering about grulla (with cream) as well, since that's the only color I can think of where the horse would appear to have a gray colored coat with dark points (aside from the actual gray gene) I don't think the foal got the dun gene, though, and that doesn't explain where the agouti could have come from.
Looking at that photo, if the rear end behind the foal in question is the dam, I am feeling like she is smoky black. For those asking for clarification, "black buckskin" is another term for smoky black, or a black horse with a single cream gene.
Foal is definitely showing some sort of cream IMO. If that is the dam, she doesn't look smoky brown to me, she is just too dark all over. However, and here comes the disclaimer, that is a really, really, really, really bad photo to judge the mare's colour from - so I am in no way saying that I am 100% certain on that one.